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CVE-2026-21629— Joomla! Core - [20260301] - ACL hardening in com_ajax

Quick assessment

Affected
Joomla! Project Joomla! CMS
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Joomla! CMS是Joomla!开源的一个内容管理系统。 Joomla! CMS存在访问控制错误漏洞，该漏洞源于管理区域中ajax组件被排除在默认登录用户检查之外，可能导致第三方开发者产生意外行为。

AI Predicted 7.5 Difficulty: Easy EPSS 0.25% · P15

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts
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I. Basic Information for CVE-2026-21629

Vulnerability Information
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Vulnerability Title
Joomla! Core - [20260301] - ACL hardening in com_ajax
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Joomla! CMS 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Joomla! CMS是Joomla!开源的一个内容管理系统。 Joomla! CMS存在访问控制错误漏洞，该漏洞源于管理区域中ajax组件被排除在默认登录用户检查之外，可能导致第三方开发者产生意外行为。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Joomla! Project Joomla! CMS 3.0.0-5.4.3 -

II. Public POCs for CVE-2026-21629

# POC Description Source Link Shenlong Link
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default-local-qwen3.6 · 10635 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
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POC zip download
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III. Intelligence Information for CVE-2026-21629

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Vendor Advisories for CVE-2026-21629 (1)

Same Patch Batch · Joomla! Project · 2026-04-01 · 6 CVEs total

CVE-2026-23898 8.6 HIGH Joomla! Core - [20260305] - Arbitrary file deletion in com_joomlaupdate
CVE-2026-21630 Joomla! Core - [20260302] - SQL injection in com_content articles webservice endpoint
CVE-2026-21631 Joomla! Core - [20260303] - XSS vector in com_associations comparison view
CVE-2026-21632 Joomla! Core - [20260304] - XSS vectors in various article title outputs
CVE-2026-23899 Joomla! Core - [20260306] - Improper access check in webservice endpoints

IV. Related Vulnerabilities

Same product: Joomla! CMS
Same vendor: Joomla! Project
Same weakness: CWE-284

V. Comments for CVE-2026-21629

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