FKIE_CVE-2026-23920

Vulnerability from fkie_nvd - Published: 2026-03-24 19:16 - Updated: 2026-09-10 21:15
Severity
8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
Host and event action script input is validated with a regex (set by the administrator), but the validation runs in multiline mode. If ^ and $ anchors are used in user input validation, an injected newline lets authenticated users bypass the check and inject shell commands.
References
security@zabbix.comhttps://support.zabbix.com/browse/ZBX-27639Vendor Advisory
Impacted products
Vendor Product Version
zabbix zabbix *
zabbix zabbix *
zabbix zabbix *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unknown",
          "modules": [
            "Server",
            "Proxy"
          ],
          "product": "Zabbix",
          "repo": "https://git.zabbix.com/",
          "vendor": "Zabbix",
          "versions": [
            {
              "changes": [
                {
                  "at": "7.0.22",
                  "status": "unaffected"
                }
              ],
              "lessThanOrEqual": "7.0.21",
              "status": "affected",
              "version": "7.0.0",
              "versionType": "git"
            },
            {
              "changes": [
                {
                  "at": "7.2.15",
                  "status": "unaffected"
                }
              ],
              "lessThanOrEqual": "7.2.14",
              "status": "affected",
              "version": "7.2.0",
              "versionType": "git"
            },
            {
              "changes": [
                {
                  "at": "7.4.6",
                  "status": "unaffected"
                }
              ],
              "lessThanOrEqual": "7.4.5",
              "status": "affected",
              "version": "7.4.0",
              "versionType": "git"
            }
          ]
        }
      ],
      "source": "security@zabbix.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:zabbix:zabbix:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "81A39B0A-C0D7-464A-AFE5-E88314DB4F35",
              "versionEndExcluding": "7.0.22",
              "versionStartIncluding": "7.0.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:zabbix:zabbix:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "D84A2506-3FE5-4251-8F53-D870916024C2",
              "versionEndExcluding": "7.2.15",
              "versionStartIncluding": "7.2.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:zabbix:zabbix:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "82070C2B-7BD0-4F96-AE73-74048BFFB69D",
              "versionEndExcluding": "7.4.6",
              "versionStartIncluding": "7.4.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Host and event action script input is validated with a regex (set by the administrator), but the validation runs in multiline mode. If ^ and $ anchors are used in user input validation, an injected newline lets authenticated users bypass the check and inject shell commands."
    },
    {
      "lang": "es",
      "value": "La entrada de scripts de acci\u00f3n de host y evento se valida con una expresi\u00f3n regular (regex) (establecida por el administrador), pero la validaci\u00f3n se ejecuta en modo multil\u00ednea. Si los anclajes ^ y $ se utilizan en la validaci\u00f3n de entrada del usuario, un salto de l\u00ednea inyectado permite a los usuarios autenticados eludir la verificaci\u00f3n e inyectar comandos de shell."
    }
  ],
  "id": "CVE-2026-23920",
  "lastModified": "2026-09-10T21:15:39.950",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 7.7,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "LOW",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "HIGH",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security@zabbix.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-23920",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-03-25T00:00:00+00:00",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-03-24T19:16:49.557",
  "references": [
    {
      "source": "security@zabbix.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://support.zabbix.com/browse/ZBX-27639"
    }
  ],
  "sourceIdentifier": "security@zabbix.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-78"
        }
      ],
      "source": "security@zabbix.com",
      "type": "Secondary"
    }
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.