{"id":"CVE-2026-90913","title":"Joomla! Core - [20260903] - Core - Improper ACL checks for access level webservice endpoints in Joomla 4.0.0-5.4.8, 6.0.0-6.1.3 - An improper access check allows unauthorized users to perform mutation actions in access level endpoints.","summary":"Joomla! Core - [20260903] - Core - Improper ACL checks for access level webservice endpoints in Joomla 4.0.0-5.4.8, 6.0.0-6.1.3 - An improper access check allows unauthorized users to perform mutation actions in access level endpoints.","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:L/A:N","cwe":["CWE-284"],"vendor":"joomla","product":"joomla!","affected":["joomla! >= 4.0.0, < 5.4.8","joomla! >= 6.0.0, < 6.1.3"],"patched":["joomla! 6.1.3"],"published":"2026-09-29","updated":"2026-10-06","sourceUpdated":"2026-10-06T16:33:08.870","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90913","references":[{"url":"https://developer.joomla.org/security-centre/1083-20260903-core-improper-acl-checks-for-user-level-webservice-endpoints.html","label":"security@joomla.org"},{"url":"https://www.joomla.org/","label":"security@joomla.org"}],"tags":["nvd","cve.org"],"epss":0.00214,"epssPercentile":0.11663,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-30T15:11:46.721826Z"},"scores":{"nvd":5.5,"cna":7},"ingestedAt":"2026-09-29T17:41:02.208Z","slug":"CVE-2026-90913","body":"## Overview\n\nJoomla! Core - [20260903] - Core - Improper ACL checks for access level webservice endpoints in Joomla 4.0.0-5.4.8, 6.0.0-6.1.3 - An improper access check allows unauthorized users to perform mutation actions in access level endpoints.\n\n## Affected\n\n- `joomla! >= 4.0.0, < 5.4.8`\n- `joomla! >= 6.0.0, < 6.1.3`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `joomla! 6.1.3`","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":216554,"id":"CVE-2026-90913","ts":1791306615649,"field":"cvss","old":"7","new":"5.5"},{"seq":216553,"id":"CVE-2026-90913","ts":1791306615649,"field":"severity","old":"high","new":"medium"}]}