Regular Labs Extension Manager
Affected versions: ≤ 9.2.5
Full advisory: our disclosure post
CVE-2026-64791HighCVSS 8.8CVE published 22 July 2026Added to mySites.guru 22 July 2026
Regular Labs Extension Manager (com_regularlabsmanager) <= 9.2.5 - Broken Access Control (unauthorised extension install/update/uninstall)
Regular Labs Extension Manager up to and including 9.2.5. Administrator routes and the install/update/uninstall processing did not consistently enforce component-management and installation permissions, so an unauthorised backend user, or a CSRF attack against a logged-in administrator, could install, update or remove Joomla extensions - which is a site takeover primitive. Also affected by CVE-2026-63265, missing CSRF tokens and permission checks on the shared Regular Labs AJAX endpoints. Fixed in the Regular Labs security release of 22 July 2026 (9.3.0). Update via Joomla Update or the Regular Labs Extension Manager.
Is my site affected?
- Affected
- Regular Labs Extension Manager up to and including 9.2.5
- Fixed in
- A release after 9.2.5
- What to do
- Update Regular Labs Extension Manager to the newest release from the vendor. This flaw covers versions up to 9.2.5, so any later release is outside it.
How CVE-2026-64791 is scored
The base metrics as CISA-ADP published them, and what each one means for a site running an affected version. Threat and environmental metrics are left out: they describe a moment or a particular install rather than the flaw.
8.8 High
CVSS 3.1, scored by CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HHow it is reached
- AV:N Attack vector
- Network. Reachable across the internet
- AC:L Attack complexity
- Low. Nothing to work around, it just works
- PR:N Privileges required
- None. No account needed
- UI:R User interaction
- Required. Someone has to click or visit something
- S:U Scope
- Unchanged. Contained to the extension it is in
What it does
- C:H Confidentiality
- High. Everything the site holds can be read
- I:H Integrity
- High. Data and files can be altered at will
- A:H Availability
- High. The site can be taken down
Timeline
- 22 July 2026CVE-2026-64791 record published by its CNA
- 22 July 2026mySites.guru check added for Regular Labs Extension Manager (up to and including 9.2.5)
- 22 July 2026We published: Regular Labs Patched Its Whole Joomla Extension Catalogue at Once
Rule details
Our disclosure post
Other vulnerabilities in Regular Labs Extension Manager
Updating for CVE-2026-64791 alone can leave a site on a release another rule still matches. These are the other flaws we check for in the same extension.
Regular Labs Extension Manager
- CVE-2026-63265 High, up to and including 9.2.5
References
- CVE-2026-64791 on cve.org (the official CVE record)
- CVE-2026-64791 in the NIST National Vulnerability Database
- Regular Labs Patched Its Whole Joomla Extension Catalogue at Once
CVE-2026-64791 questions
Which versions are affected by CVE-2026-64791?
CVE-2026-64791 affects Regular Labs Extension Manager up to and including 9.2.5.
How do I fix CVE-2026-64791?
Update Regular Labs Extension Manager to the newest release from the vendor. This flaw covers versions up to 9.2.5, so any later release is outside it.
How severe is CVE-2026-64791?
CISA-ADP scores it 8.8 (High) under CVSS 3.1. In plain terms: reachable across the internet, no account needed and someone has to click or visit something.
Running an affected version on a site you manage?
A free audit tells you which of your Joomla and WordPress sites run an affected version, which are out of date, and which have not been backed up. No card required. If a site is already compromised, fix.mysites.guru is a single fixed fee per incident, usually resolved the same day.
This check is part of the mySites.guru Joomla vulnerability scanner, which reads every installed extension's version on each audit. Browse the rest of the Joomla vulnerability database.
Rules current as of 5 October 2026.