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[20260502] - Core - XSS in com_associations

  • Project: Joomla!
  • SubProject: CMS
  • Impact: Moderate
  • Severity: Moderate
  • Probability: Low
  • Versions: 4.0.0-5.4.5, 6.0.0-6.1.0
  • Exploit type: XSS
  • Reported Date: 2026-04-01
  • Fixed Date: 2026-05-26
  • CVE Number: CVE-2026-25901

Description

Lack of output escaping leads to a XSS vector in the multilingual associations component.

Affected Installs

Joomla! CMS versions 4.0.0-5.4.5, 6.0.0-6.1.0

Solution

Upgrade to version 5.4.6 or 6.1.1

Contact

The JSST at the Joomla! Security Centre.

Reported By:  vnth4nhnt from CyStack, Pavel Kohout from Aisle Research

[20260501] - Core - XSS in feed modules

  • Project: Joomla!
  • SubProject: CMS
  • Impact: Moderate
  • Severity: Moderate
  • Probability: Low
  • Versions: 3.0.0-5.4.5, 6.0.0-6.1.0
  • Exploit type: XSS
  • Reported Date: 2026-03-28
  • Fixed Date: 2026-05-26
  • CVE Number: CVE-2026-25900

Description

Lack of output escaping leads to a XSS vector in the feed modules.

Affected Installs

Joomla! CMS versions 3.0.0-5.4.5, 6.0.0-6.1.0

Solution

Upgrade to version 5.4.6 or 6.1.1

Contact

The JSST at the Joomla! Security Centre.

Reported By:  Mohamed Elabbas, Sun Huang

[20260301] - Core - ACL hardening in com_ajax

  • Project: Joomla!
  • SubProject: CMS
  • Impact: Low
  • Severity: Low
  • Probability: Moderate
  • Versions: 3.0.0-5.4.3, 6.0.0-6.0.3
  • Exploit type: Incorrect Access Control
  • Reported Date: 2026-03-11
  • Fixed Date: 2026-03-31
  • CVE Number: CVE-2026-21629

Description

The ajax component was excluded from the default logged-in-user check in the administrative area. This behavior was potentially unexpected by 3rd party developers.

Affected Installs

Joomla! CMS versions 3.0.0-5.4.3, 6.0.0-6.0.3

Solution

Upgrade to version 5.4.4 or 6.0.4

Contact

The JSST at the Joomla! Security Centre.

Reported By:  JSST