Search

Find a vulnerability

Search criteria

    5 vulnerabilities by postcss

    CVE-2026-104844 (GCVE-0-2026-104844)

    Vulnerability from cvelistv5 – Published: 2026-10-02 15:43 – Updated: 2026-10-02 16:16
    VLAI
    Title
    PostCSS: Quadratic complexity in flat selector parsing allows CPU exhaustion
    Summary
    PostCSS Selector Parser is a CSS selector parser that integrates with PostCSS but does not require it. Prior to 7.1.6, src/parser.js splitWord() can receive a flat selector as one word token carrying many class or ID indexes because period and hash characters are not tokenizer word delimiters. The uniqs() deduplication and per-index class and ID membership checks repeatedly scan the class and ID index arrays, while a separate Sass-interpolation filtering pass also performs repeated linear scanning. Together, these passes make parsing quadratic in the number of indexes and allow a crafted selector to occupy a synchronous parser thread. The maxNestingDepth guard does not mitigate the issue because the hostile selector can have zero nesting depth. Only consumers that synchronously parse untrusted selectors in an exposed request path are affected; ordinary build-time parsing of trusted sources is not affected. This issue is fixed in version 7.1.6.
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-10-02 16:16 UTC
    CWE
    • CWE-400 - Uncontrolled Resource Consumption
    • CWE-407 - Inefficient Algorithmic Complexity
    Impacted products
    Show details on NVD website

    {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-104844",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-10-02T16:16:26.803770Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-10-02T16:16:45.990Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "product": "postcss-selector-parser",
              "vendor": "postcss",
              "versions": [
                {
                  "status": "affected",
                  "version": "\u003c 7.1.6"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "PostCSS Selector Parser is a CSS selector parser that integrates with PostCSS but does not require it. Prior to 7.1.6, src/parser.js splitWord() can receive a flat selector as one word token carrying many class or ID indexes because period and hash characters are not tokenizer word delimiters. The uniqs() deduplication and per-index class and ID membership checks repeatedly scan the class and ID index arrays, while a separate Sass-interpolation filtering pass also performs repeated linear scanning. Together, these passes make parsing quadratic in the number of indexes and allow a crafted selector to occupy a synchronous parser thread. The maxNestingDepth guard does not mitigate the issue because the hostile selector can have zero nesting depth. Only consumers that synchronously parse untrusted selectors in an exposed request path are affected; ordinary build-time parsing of trusted sources is not affected. This issue is fixed in version 7.1.6."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "attackComplexity": "HIGH",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 5.9,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              }
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-400",
                  "description": "CWE-400: Uncontrolled Resource Consumption",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            },
            {
              "descriptions": [
                {
                  "cweId": "CWE-407",
                  "description": "CWE-407: Inefficient Algorithmic Complexity",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-10-02T15:43:14.082Z",
            "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
            "shortName": "GitHub_M"
          },
          "references": [
            {
              "name": "https://github.com/postcss/postcss-selector-parser/security/advisories/GHSA-rj75-hqrm-r3gf",
              "tags": [
                "x_refsource_CONFIRM"
              ],
              "url": "https://github.com/postcss/postcss-selector-parser/security/advisories/GHSA-rj75-hqrm-r3gf"
            },
            {
              "name": "https://github.com/postcss/postcss-selector-parser/commit/62b191792df0a0bc56062e5a875bc74aae2a51cd",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/postcss/postcss-selector-parser/commit/62b191792df0a0bc56062e5a875bc74aae2a51cd"
            },
            {
              "name": "https://github.com/postcss/postcss-selector-parser/releases/tag/7.1.6",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/postcss/postcss-selector-parser/releases/tag/7.1.6"
            }
          ],
          "source": {
            "advisory": "GHSA-rj75-hqrm-r3gf",
            "discovery": "UNKNOWN"
          },
          "title": "PostCSS: Quadratic complexity in flat selector parsing allows CPU exhaustion"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "assignerShortName": "GitHub_M",
        "cveId": "CVE-2026-104844",
        "datePublished": "2026-10-02T15:43:14.082Z",
        "dateReserved": "2026-10-02T14:38:43.243Z",
        "dateUpdated": "2026-10-02T16:16:45.990Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }

    CVE-2026-73646 (GCVE-0-2026-73646)

    Vulnerability from cvelistv5 – Published: 2026-08-17 15:35 – Updated: 2026-08-17 16:36
    VLAI
    Title
    PostCSS: Path Traversal in Previous Source Map Auto-Loading (sourceMappingURL) leads to Arbitrary .map File Disclosure
    Summary
    PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. Prior to 8.5.18, lib/previous-map.js loadMap() passes attacker-controlled sourceMappingURL values to join(dirname(opts.from), annotation), and loadFile() permits traversed or absolute .map paths, allowing untrusted CSS processed without map: false to disclose sourcesContent from arbitrary reachable .map files through result.map. This issue is fixed in version 8.5.18.
    SSVC
    Exploitation: poc Automatable: yes Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-08-17 16:35 UTC
    CWE
    • CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
    Impacted products
    Vendor Product Version
    postcss postcss Affected: < 8.5.18
    Create a notification for this product.
    Show details on NVD website

    {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-73646",
                    "options": [
                      {
                        "Exploitation": "poc"
                      },
                      {
                        "Automatable": "yes"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-08-17T16:35:17.036116Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-08-17T16:36:37.422Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "references": [
              {
                "tags": [
                  "exploit"
                ],
                "url": "https://github.com/postcss/postcss/security/advisories/GHSA-r28c-9q8g-f849"
              }
            ],
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "product": "postcss",
              "vendor": "postcss",
              "versions": [
                {
                  "status": "affected",
                  "version": "\u003c 8.5.18"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. Prior to 8.5.18, lib/previous-map.js loadMap() passes attacker-controlled sourceMappingURL values to join(dirname(opts.from), annotation), and loadFile() permits traversed or absolute .map paths, allowing untrusted CSS processed without map: false to disclose sourcesContent from arbitrary reachable .map files through result.map. This issue is fixed in version 8.5.18."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
                "version": "3.1"
              }
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-22",
                  "description": "CWE-22: Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-17T15:35:13.518Z",
            "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
            "shortName": "GitHub_M"
          },
          "references": [
            {
              "name": "https://github.com/postcss/postcss/security/advisories/GHSA-r28c-9q8g-f849",
              "tags": [
                "x_refsource_CONFIRM"
              ],
              "url": "https://github.com/postcss/postcss/security/advisories/GHSA-r28c-9q8g-f849"
            },
            {
              "name": "https://github.com/postcss/postcss/commit/95663d3eb7ba26f4854dd19d3b4f4425760cf56c",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/postcss/postcss/commit/95663d3eb7ba26f4854dd19d3b4f4425760cf56c"
            },
            {
              "name": "https://github.com/postcss/postcss/releases/tag/8.5.18",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/postcss/postcss/releases/tag/8.5.18"
            }
          ],
          "source": {
            "advisory": "GHSA-r28c-9q8g-f849",
            "discovery": "UNKNOWN"
          },
          "title": "PostCSS: Path Traversal in Previous Source Map Auto-Loading (sourceMappingURL) leads to Arbitrary .map File Disclosure"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "assignerShortName": "GitHub_M",
        "cveId": "CVE-2026-73646",
        "datePublished": "2026-08-17T15:35:13.518Z",
        "dateReserved": "2026-08-13T14:04:09.604Z",
        "dateUpdated": "2026-08-17T16:36:37.422Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }

    CVE-2026-69153 (GCVE-0-2026-69153)

    Vulnerability from cvelistv5 – Published: 2026-08-03 16:56 – Updated: 2026-08-03 18:28
    VLAI
    Title
    PostCSS: incomplete fix of CVE-2026-45623 — attacker-controlled sourceMappingURL reads arbitrary .map files when `from` is unset
    Summary
    PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. Prior to 8.5.19, if from is unset, an attacker can cause PreviousMap.loadFile() to read an unintended source-map file by supplying an absolute or directory-traversal sourceMappingURL. The resulting map’s sources and sourcesContent may then be exposed to the application. This issue is fixed in version 8.5.19.
    SSVC
    Exploitation: poc Automatable: no Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-08-03 18:28 UTC
    CWE
    • CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
    • CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
    Impacted products
    Vendor Product Version
    postcss postcss Affected: < 8.5.19
    Create a notification for this product.
    Show details on NVD website

    {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-69153",
                    "options": [
                      {
                        "Exploitation": "poc"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-08-03T18:28:28.771563Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-08-03T18:28:59.737Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "references": [
              {
                "tags": [
                  "exploit"
                ],
                "url": "https://github.com/postcss/postcss/security/advisories/GHSA-fxqj-rqcc-2cmp"
              }
            ],
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "product": "postcss",
              "vendor": "postcss",
              "versions": [
                {
                  "status": "affected",
                  "version": "\u003c 8.5.19"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. Prior to 8.5.19, if from is unset, an attacker can cause PreviousMap.loadFile() to read an unintended source-map file by supplying an absolute or directory-traversal sourceMappingURL. The resulting map\u2019s sources and sourcesContent may then be exposed to the application. This issue is fixed in version 8.5.19."
            }
          ],
          "metrics": [
            {
              "cvssV4_0": {
                "attackComplexity": "LOW",
                "attackRequirements": "PRESENT",
                "attackVector": "NETWORK",
                "baseScore": 6.3,
                "baseSeverity": "MEDIUM",
                "privilegesRequired": "NONE",
                "subAvailabilityImpact": "NONE",
                "subConfidentialityImpact": "NONE",
                "subIntegrityImpact": "NONE",
                "userInteraction": "NONE",
                "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
                "version": "4.0",
                "vulnAvailabilityImpact": "NONE",
                "vulnConfidentialityImpact": "LOW",
                "vulnIntegrityImpact": "NONE"
              }
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-22",
                  "description": "CWE-22: Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            },
            {
              "descriptions": [
                {
                  "cweId": "CWE-200",
                  "description": "CWE-200: Exposure of Sensitive Information to an Unauthorized Actor",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-03T16:56:25.733Z",
            "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
            "shortName": "GitHub_M"
          },
          "references": [
            {
              "name": "https://github.com/postcss/postcss/security/advisories/GHSA-fxqj-rqcc-2cmp",
              "tags": [
                "x_refsource_CONFIRM"
              ],
              "url": "https://github.com/postcss/postcss/security/advisories/GHSA-fxqj-rqcc-2cmp"
            },
            {
              "name": "https://github.com/postcss/postcss/commit/7beca139e70f9075c6b19700fcb00dd8033e5da8",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/postcss/postcss/commit/7beca139e70f9075c6b19700fcb00dd8033e5da8"
            },
            {
              "name": "https://github.com/postcss/postcss/releases/tag/8.5.19",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/postcss/postcss/releases/tag/8.5.19"
            }
          ],
          "source": {
            "advisory": "GHSA-fxqj-rqcc-2cmp",
            "discovery": "UNKNOWN"
          },
          "title": "PostCSS: incomplete fix of CVE-2026-45623 \u2014 attacker-controlled sourceMappingURL reads arbitrary .map files when `from` is unset"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "assignerShortName": "GitHub_M",
        "cveId": "CVE-2026-69153",
        "datePublished": "2026-08-03T16:56:25.733Z",
        "dateReserved": "2026-08-03T15:47:09.654Z",
        "dateUpdated": "2026-08-03T18:28:59.737Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }

    CVE-2026-45623 (GCVE-0-2026-45623)

    Vulnerability from cvelistv5 – Published: 2026-07-27 17:23 – Updated: 2026-07-27 17:44
    VLAI
    Title
    PostCSS: Arbitrary file read and information disclosure via attacker-controlled sourceMappingURL in CSS comments
    Summary
    PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. In versions 8.5.11 and prior, the PreviousMap parses the /*# sourceMappingURL=PATH */ comment from any CSS string passed to process() and dereferences PATH against the local filesystem with no scheme, allowlist, or traversal check. An attacker who controls the CSS input can cause the host process to read any file readable by Node and leak the first ~10 bytes of its content through the resulting JSON.parse SyntaxError message. The bug also yields a precise file-existence oracle and a controllable-read primitive that may be combined with large-file targets for DoS. The behaviour is triggered with PostCSS's default options — no from, no map, no plugins required — and is therefore reachable from any pipeline that runs untrusted CSS through PostCSS (CMS themes, user-uploaded styles, browser-extension/userstyle processors, build pipelines for third-party packages, blog comment renderers, etc.). This issue has been fixed in version 8.5.12.
    SSVC
    Exploitation: poc Automatable: yes Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-07-27 17:44 UTC
    CWE
    • CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
    • CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
    References
    Impacted products
    Vendor Product Version
    postcss postcss Affected: < 8.5.12
    Create a notification for this product.
    Show details on NVD website

    {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-45623",
                    "options": [
                      {
                        "Exploitation": "poc"
                      },
                      {
                        "Automatable": "yes"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-07-27T17:44:10.727948Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-07-27T17:44:31.606Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "references": [
              {
                "tags": [
                  "exploit"
                ],
                "url": "https://github.com/postcss/postcss/security/advisories/GHSA-6g55-p6wh-862q"
              }
            ],
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "product": "postcss",
              "vendor": "postcss",
              "versions": [
                {
                  "status": "affected",
                  "version": "\u003c 8.5.12"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. In versions 8.5.11 and prior, the PreviousMap parses the /*# sourceMappingURL=PATH */ comment from any CSS string passed to process() and dereferences PATH against the local filesystem with no scheme, allowlist, or traversal check. An attacker who controls the CSS input can cause the host process to read any file readable by Node and leak the first ~10 bytes of its content through the resulting JSON.parse SyntaxError message. The bug also yields a precise file-existence oracle and a controllable-read primitive that may be combined with large-file targets for DoS. The behaviour is triggered with PostCSS\u0027s default options \u2014 no from, no map, no plugins required \u2014 and is therefore reachable from any pipeline that runs untrusted CSS through PostCSS (CMS themes, user-uploaded styles, browser-extension/userstyle processors, build pipelines for third-party packages, blog comment renderers, etc.). This issue has been fixed in version 8.5.12."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
                "version": "3.1"
              }
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-22",
                  "description": "CWE-22: Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            },
            {
              "descriptions": [
                {
                  "cweId": "CWE-200",
                  "description": "CWE-200: Exposure of Sensitive Information to an Unauthorized Actor",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-07-27T17:23:13.326Z",
            "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
            "shortName": "GitHub_M"
          },
          "references": [
            {
              "name": "https://github.com/postcss/postcss/security/advisories/GHSA-6g55-p6wh-862q",
              "tags": [
                "x_refsource_CONFIRM"
              ],
              "url": "https://github.com/postcss/postcss/security/advisories/GHSA-6g55-p6wh-862q"
            }
          ],
          "source": {
            "advisory": "GHSA-6g55-p6wh-862q",
            "discovery": "UNKNOWN"
          },
          "title": "PostCSS: Arbitrary file read and information disclosure via attacker-controlled sourceMappingURL in CSS comments"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "assignerShortName": "GitHub_M",
        "cveId": "CVE-2026-45623",
        "datePublished": "2026-07-27T17:23:13.326Z",
        "dateReserved": "2026-05-12T20:31:43.449Z",
        "dateUpdated": "2026-07-27T17:44:31.606Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }

    CVE-2026-41305 (GCVE-0-2026-41305)

    Vulnerability from cvelistv5 – Published: 2026-04-24 02:27 – Updated: 2026-04-24 16:23
    VLAI
    Title
    PostCSS has XSS via Unescaped </style> in its CSS Stringify Output
    Summary
    PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. Versions prior to 8.5.10 do not escape `</style>` sequences when stringifying CSS ASTs. When user-submitted CSS is parsed and re-stringified for embedding in HTML `<style>` tags, `</style>` in CSS values breaks out of the style context, enabling XSS. Version 8.5.10 fixes the issue.
    SSVC
    Exploitation: poc Automatable: no Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-04-24 16:22 UTC
    CWE
    • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
    References
    Impacted products
    Vendor Product Version
    postcss postcss Affected: < 8.5.10
    Create a notification for this product.
    Show details on NVD website

    {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-41305",
                    "options": [
                      {
                        "Exploitation": "poc"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-04-24T16:22:58.569354Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-04-24T16:23:41.198Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "references": [
              {
                "tags": [
                  "exploit"
                ],
                "url": "https://github.com/postcss/postcss/security/advisories/GHSA-qx2v-qp2m-jg93"
              }
            ],
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "product": "postcss",
              "vendor": "postcss",
              "versions": [
                {
                  "status": "affected",
                  "version": "\u003c 8.5.10"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. Versions prior to 8.5.10 do not escape `\u003c/style\u003e` sequences when stringifying CSS ASTs. When user-submitted CSS is parsed and re-stringified for embedding in HTML `\u003cstyle\u003e` tags, `\u003c/style\u003e` in CSS values breaks out of the style context, enabling XSS. Version 8.5.10 fixes the issue."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 6.1,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "LOW",
                "integrityImpact": "LOW",
                "privilegesRequired": "NONE",
                "scope": "CHANGED",
                "userInteraction": "REQUIRED",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
                "version": "3.1"
              }
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-79",
                  "description": "CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-04-24T02:27:47.719Z",
            "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
            "shortName": "GitHub_M"
          },
          "references": [
            {
              "name": "https://github.com/postcss/postcss/security/advisories/GHSA-qx2v-qp2m-jg93",
              "tags": [
                "x_refsource_CONFIRM"
              ],
              "url": "https://github.com/postcss/postcss/security/advisories/GHSA-qx2v-qp2m-jg93"
            },
            {
              "name": "https://github.com/postcss/postcss/releases/tag/8.5.10",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/postcss/postcss/releases/tag/8.5.10"
            }
          ],
          "source": {
            "advisory": "GHSA-qx2v-qp2m-jg93",
            "discovery": "UNKNOWN"
          },
          "title": "PostCSS has XSS via Unescaped \u003c/style\u003e in its CSS Stringify Output"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "assignerShortName": "GitHub_M",
        "cveId": "CVE-2026-41305",
        "datePublished": "2026-04-24T02:27:47.719Z",
        "dateReserved": "2026-04-20T14:01:46.670Z",
        "dateUpdated": "2026-04-24T16:23:41.198Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }