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joomla-cms

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.

CVE-2026-21629 is an improper access control vulnerability (CWE-284) identified in the Joomla! Content Management System (CMS), specifically affecting versions 3.0.0 through 5.4.3 and 6.0.0 through 6.0.3. The root cause is that the ajax component within the administrative area was excluded from the default logged-in user authentication check. This exclusion means that certain ajax requests can be processed without verifying if the requester is an authenticated administrator or user. This behavior was potentially unexpected by third-party developers relying on Joomla!'s standard access control mechanisms. The vulnerability allows remote attackers to invoke administrative ajax functions without authentication, potentially exposing sensitive administrative operations or data. The CVSS 4.0 vector indicates the attack can be performed remotely over the network (AV:N) with low attack complexity (AC:L), no privileges required (PR:N), and no user interaction (UI:N). The impact on confidentiality, integrity, and availability is low to limited (VC:L, VI:L, VA:L), reflecting partial exposure or limited control. No known exploits have been reported in the wild as of the publication date. The vulnerability was reserved on January 1, 2026, and published on April 1, 2026. No official patches are linked yet, so mitigation relies on configuration changes or temporary access restrictions until updates are released.

Detailed information about CVE-2026-21629: CWE-284 Improper Access Control in Joomla! Project Joomla! CMS affecting Joomla! Project Joomla! CMS. Get real-time u

CVE-2026-21629: CWE-284 Improper Access Control in Joomla! Project Joomla! CMS - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-21629: CWE-284 Improper Access Control in Joomla! Project Joomla! CMS

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