Vulnerability-Lookup

CVE-2026-71573 (GCVE-0-2026-71573)

Vulnerability from cvelistv5 – Published: 2026-08-18 16:09 – Updated: 2026-08-19 04:50

Title

Joomla! Core - [20260802] - Improper CORS origin validation in Joomla 4.0.0-5.4.7, 6.0.0-6.1.2

Summary

Joomla! Core - [20260802] - Improper CORS origin validation in Joomla 4.0.0-5.4.7, 6.0.0-6.1.2 - An improper implementation prevented configured CORS origins from being properly validated in CORS requests.

Severity

6.9 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:L

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-18 19:02 UTC

CWE

CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')

Assigner

Joomla mitre root

References

2 references

URL	Tags
https://www.joomla.org/	product
https://developer.joomla.org/security-centre/2026…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
Joomla! Project	Joomla! CMS	Affected: 4.0.0-5.4.6 Affected: 6.0.0-6.1.2

Credits

Agamemnon Fakas caveeroo

Show details on NVD website

JSON

To clipboard

{
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        }
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      },
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                  "version": "6.0.0-6.1.2"
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          ],
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            }
          ],
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              "url": "https://developer.joomla.org/security-centre/20260802-core-improper-cors-origin-validation.html"
            }
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            "discovery": "UNKNOWN"
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}

bit-joomla-2026-71573

Vulnerability from bitnami_vulndb

Published

2026-09-04 08:47

Modified

2026-09-10 15:46

Summary

Joomla! Core - [20260802] - Improper CORS origin validation in Joomla 4.0.0-5.4.7, 6.0.0-6.1.2

Details

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "joomla",
        "purl": "pkg:bitnami/joomla"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.0.0"
            },
            {
              "fixed": "5.4.8"
            },
            {
              "introduced": "6.0.0"
            },
            {
              "fixed": "6.1.3"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-71573"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:joomla:joomla!:*:*:*:*:*:*:*:*"
    ],
    "severity": "High"
  },
  "details": "Joomla! Core - [20260802] - Improper CORS origin validation in Joomla 4.0.0-5.4.7, 6.0.0-6.1.2 - An improper implementation prevented configured CORS origins from being properly validated in CORS requests.",
  "id": "BIT-joomla-2026-71573",
  "modified": "2026-09-10T15:46:03.895Z",
  "published": "2026-09-04T08:47:51.130Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://developer.joomla.org/security-centre/20260802-core-improper-cors-origin-validation.html"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-71573"
    },
    {
      "type": "WEB",
      "url": "https://www.joomla.org/"
    }
  ],
  "schema_version": "1.6.2",
  "summary": "Joomla! Core - [20260802] - Improper CORS origin validation in Joomla 4.0.0-5.4.7, 6.0.0-6.1.2"
}

CERTFR-2026-AVI-1046

Vulnerability from certfr_avis - Published: 2026-08-19 - Updated: 2026-08-19

De multiples vulnérabilités ont été découvertes dans Joomla!. Certaines d'entre elles permettent à un attaquant de provoquer une exécution de code arbitraire à distance, une atteinte à l'intégrité des données et une injection de code indirecte à distance (XSS).

Solutions

Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).

Impacted products

	Vendor	Product	Description
	Joomla!	Joomla!	Joomla! versions 3.x à 5.x antérieures à 5.4.8
	Joomla!	Joomla!	Joomla! versions 6.x antérieures à 6.1.3

References

Title

Publication Time

EUVD-2026-87937

European Vulnerability Database identifier assigned by ENISA

Reserved

2026-10-03 10:55

Assigner

ENISA

Alias of

a CVE record, shown under related vulnerabilities. This identifier carries no description, severity or references of its own: they belong to that CVE.

JSON

To clipboard

{
  "assigner": "ENISA",
  "date_reserved": "2026-10-03T10:55:06.970768+00:00",
  "id": "EUVD-2026-87937"
}

FKIE_CVE-2026-71573

Vulnerability from fkie_nvd - Published: 2026-08-18 17:17 - Updated: 2026-09-03 15:04

Severity

8.3 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L

Summary

References

	URL	Tags
	security@joomla.org	https://developer.joomla.org/security-centre/20260802-core-improper-cors-origin-validation.html	Vendor Advisory, Broken Link
	security@joomla.org	https://www.joomla.org/	Product

Impacted products

	Vendor	Product	Version
	joomla	joomla\!	*
	joomla	joomla\!	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Joomla! CMS",
          "vendor": "Joomla! Project",
          "versions": [
            {
              "status": "affected",
              "version": "4.0.0-5.4.6"
            },
            {
              "status": "affected",
              "version": "6.0.0-6.1.2"
            }
          ]
        }
      ],
      "source": "security@joomla.org"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:joomla:joomla\\!:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "03C3BB6E-737B-402D-8374-AD70BD5DA5DF",
              "versionEndExcluding": "5.4.8",
              "versionStartIncluding": "4.0.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:joomla:joomla\\!:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "B8A0255D-2FD3-45CD-9C69-CE60C3956B95",
              "versionEndExcluding": "6.1.3",
              "versionStartIncluding": "6.0.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Joomla! Core - [20260802] - Improper CORS origin validation in Joomla 4.0.0-5.4.7, 6.0.0-6.1.2 - An improper implementation prevented configured CORS origins from being properly validated in CORS requests."
    }
  ],
  "id": "CVE-2026-71573",
  "lastModified": "2026-09-03T15:04:22.527",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 8.3,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.7,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 6.9,
          "baseSeverity": "MEDIUM",
          "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": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "LOW",
          "subConfidentialityImpact": "LOW",
          "subIntegrityImpact": "LOW",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:L/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": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security@joomla.org",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-71573",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-18T19:02:58.689211Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-18T17:17:02.243",
  "references": [
    {
      "source": "security@joomla.org",
      "tags": [
        "Vendor Advisory",
        "Broken Link"
      ],
      "url": "https://developer.joomla.org/security-centre/20260802-core-improper-cors-origin-validation.html"
    },
    {
      "source": "security@joomla.org",
      "tags": [
        "Product"
      ],
      "url": "https://www.joomla.org/"
    }
  ],
  "sourceIdentifier": "security@joomla.org",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-93"
        }
      ],
      "source": "security@joomla.org",
      "type": "Secondary"
    }
  ]
}

GHSA-JM8R-MHMW-H747

Vulnerability from github – Published: 2026-08-18 18:32 – Updated: 2026-09-03 15:32

Details

Severity

8.3 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L

6.9 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:L

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-71573"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-93"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-18T17:17:02Z",
    "severity": "MODERATE"
  },
  "details": "Joomla! Core - [20260802] - Improper CORS origin validation in Joomla 4.0.0-5.4.7, 6.0.0-6.1.2 - An improper implementation prevented configured CORS origins from being properly validated in CORS requests.",
  "id": "GHSA-jm8r-mhmw-h747",
  "modified": "2026-09-03T15:32:01Z",
  "published": "2026-08-18T18:32:01Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-71573"
    },
    {
      "type": "WEB",
      "url": "https://developer.joomla.org/security-centre/20260802-core-improper-cors-origin-validation.html"
    },
    {
      "type": "WEB",
      "url": "https://www.joomla.org"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:L/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",
      "type": "CVSS_V4"
    }
  ]
}

WID-SEC-W-2026-2926

Vulnerability from csaf_certbund - Published: 2026-08-18 22:00 - Updated: 2026-08-18 22:00

Summary

Joomla: Mehrere Schwachstellen

Severity

Hoch

Scope

10 vulnerabilities in this advisory, including CVE-2026-71573.

CVE-2026-71573

Known affected: 2 products

Open the full advisory

Sightings

Author	Source	Type	Date	Other

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.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

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.

Action not permitted

CVE-2026-71573 (GCVE-0-2026-71573)

bit-joomla-2026-71573

Vulnerability from bitnami_vulndb

CERTFR-2026-AVI-1046

Solutions

EUVD-2026-87937

FKIE_CVE-2026-71573

GHSA-JM8R-MHMW-H747

WID-SEC-W-2026-2926

Tags

Sightings

Nomenclature

Related by attack behaviour