Authorization bypass through user-controlled key in Joomla! - CVE-2026-90907
Published: September 30, 2026
Vulnerability identifier: #VU152892
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90907
CWE-ID: CWE-639
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to create guest-level user accounts.
The vulnerability exists due to authorization bypass through a user-controlled key in the profile.save controller when processing profile.save requests. A remote attacker can send a request to the profile.save controller to create guest-level user accounts.
User registration does not need to be active.
Affected software
Joomla!
How to mitigate CVE-2026-90907
Install security update from vendor's website.
Joomla! - addressed in versions 5.4.9, 6.1.4