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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact Low

Subsequent System Integrity Impact Low

Subsequent System Availability Impact Low

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable yes

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Joomla! Project Joomla! CMS unaffected
Version Status Constraints
4.0.0-5.4.6 affected —
6.0.0-6.1.2 affected —

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Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://developer.joomla.org/security-centre/20260802-core-improper-cors-origin-validation.html cve-icon cve-icon
https://www.joomla.org/ cve-icon cve-icon
History

Tue, 18 Aug 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Tue, 18 Aug 2026 16:30:00 +0000

Type Values Removed Values Added
Description 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.
Title Joomla! Core - [20260802] - Improper CORS origin validation in Joomla 4.0.0-5.4.7, 6.0.0-6.1.2
Weaknesses CWE-93
References
Metrics cvssV4_0

{'score': 6.9, 'vector': '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Joomla

Published:

Updated: 2026-08-18T19:30:43.316Z

Reserved: 2026-08-07T13:04:49.114Z

Link: CVE-2026-71573

cve-icon Vulnrichment

Updated: 2026-08-18T19:03:02.903Z

cve-icon NVD

Status : Received

Published: 2026-08-18T17:17:02.243

Modified: 2026-08-18T20:17:24.540

Link: CVE-2026-71573

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-18T17:45:07Z

Weaknesses