Origin validation error in Joomla! - CVE-2026-71573
Published: August 18, 2026
Vulnerability identifier: #VU144201
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-71573
CWE-ID: CWE-346
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass cross-origin access restrictions.
The vulnerability exists due to improper access control in CORS origin validation in Joomla! CMS when handling CORS requests. A remote attacker can send a crafted cross-origin request to bypass cross-origin access restrictions.
Affected software
Joomla!
How to mitigate CVE-2026-71573
Install security update from vendor's website.
Joomla! - addressed in versions 5.4.8, 6.1.3