[20260802] - Core - Improper CORS origin validation
Joomla patches CVE-2026-71573, improper CORS origin validation in CMS requests, in versions 5.4.8 and 6.1.3.
Joomla disclosed improper CORS origin validation (CVE-2026-71573), where configured CORS origins were not properly validated on CORS requests, rated moderate impact/severity and moderate probability. It affects Joomla CMS 4.0.0-5.4.7 and 6.0.0-6.1.2. Fixed in Joomla 5.4.8 and 6.1.3; reported on 2026-07-09 by Agamemnon Fakas and caveeroo.