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

Q: What is the severity of CVE-2026-21629?

CVE-2026-21629 has a medium severity rating due to its potential exploitation by unauthorized users.

Q: How do I fix CVE-2026-21629?

To fix CVE-2026-21629, update your Joomla! installation to the latest version that includes the necessary ACL hardening in the com_ajax component.

Q: What is affected by CVE-2026-21629?

CVE-2026-21629 affects Joomla Core, specifically the ajax component used in the administrative area.

Q: What are the potential risks of CVE-2026-21629?

The potential risks of CVE-2026-21629 include unauthorized access to sensitive functions in the administrative area by third-party developers.

Q: Is there a workaround for CVE-2026-21629?

There are no specific workarounds for CVE-2026-21629 recommended, so please ensure your Joomla! installation is updated.

Published Apr 1, 2026

Updated

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 Software

3 affected components

Joomla Joomla Core

Joomla Joomla\!>=3.0.0<5.4.4

Joomla Joomla\!>=6.0.0<6.0.4

Event History

Apr 1, 2026

CVE Published

via MITRE·09:03 AM

Data Sourced

via MITRE·09:03 AM

DescriptionWeakness

Data Sourced

via NVD·10:16 AM

DescriptionSeverityWeaknessAffected Software

Frequently Asked Questions

What is the severity of CVE-2026-21629?

CVE-2026-21629 has a medium severity rating due to its potential exploitation by unauthorized users.

How do I fix CVE-2026-21629?

To fix CVE-2026-21629, update your Joomla! installation to the latest version that includes the necessary ACL hardening in the com_ajax component.

What is affected by CVE-2026-21629?

CVE-2026-21629 affects Joomla Core, specifically the ajax component used in the administrative area.

What are the potential risks of CVE-2026-21629?

The potential risks of CVE-2026-21629 include unauthorized access to sensitive functions in the administrative area by third-party developers.

Is there a workaround for CVE-2026-21629?

There are no specific workarounds for CVE-2026-21629 recommended, so please ensure your Joomla! installation is updated.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co

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