{"id":"CVE-2026-90918","title":"Joomla! Core - [20260908] - Core - XSS in HTML Mail Templates in Joomla 4.0.0-5.4.8, 6.0.0-6.1.3 - The mail template feature lacks an escaping mechanism, causing XSS vectors in multiple extensions.","summary":"Joomla! Core - [20260908] - Core - XSS in HTML Mail Templates in Joomla 4.0.0-5.4.8, 6.0.0-6.1.3 - The mail template feature lacks an escaping mechanism, causing XSS vectors in multiple extensions.","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","cwe":["CWE-79"],"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":"2026-10-06T16:35:27.190","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90918","references":[{"url":"https://developer.joomla.org/security-centre/1088-20260908-core-xss-in-html-mail-templates.html","label":"security@joomla.org"},{"url":"https://www.joomla.org/","label":"security@joomla.org"}],"tags":["nvd","cve.org"],"epss":0.00202,"epssPercentile":0.10036,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-30T15:10:23.798690Z"},"scores":{"nvd":5.3,"cna":6.9},"ingestedAt":"2026-09-29T17:41:02.209Z","slug":"CVE-2026-90918","body":"## Overview\n\nJoomla! Core - [20260908] - Core - XSS in HTML Mail Templates in Joomla 4.0.0-5.4.8, 6.0.0-6.1.3 - The mail template feature lacks an escaping mechanism, causing XSS vectors in multiple extensions.\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":29,"depthScoreParts":{"impact":29.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":216561,"id":"CVE-2026-90918","ts":1791306617373,"field":"cvss","old":"6.9","new":"5.3"}]}