{"id":"CVE-2026-47345","aliases":["GHSA-p5j5-4j3q-8mq8"],"title":"TYPO3 HTML Sanitizer allows Cross-site Scripting","summary":"TYPO3 HTML Sanitizer allows Cross-site Scripting","severity":"medium","cwe":["CWE-79"],"vendor":"typo3","product":"typo3/html-sanitizer","ecosystem":"composer","affected":["typo3/html-sanitizer < 2.3.2"],"patched":["typo3/html-sanitizer 2.3.2"],"published":"2026-06-12","updated":"2026-06-12","source":"GHSA","sourceUrl":"https://github.com/advisories/GHSA-p5j5-4j3q-8mq8","references":[{"url":"https://github.com/TYPO3/html-sanitizer/security/advisories/GHSA-p5j5-4j3q-8mq8"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-47345"},{"url":"https://github.com/TYPO3/html-sanitizer/commit/8b5d0be44ded457ca993ec9ca93d859941c63764"},{"url":"https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/html-sanitizer/CVE-2026-47345.yaml"},{"url":"https://typo3.org/security/advisory/typo3-core-sa-2026-006"},{"url":"https://github.com/advisories/GHSA-p5j5-4j3q-8mq8"}],"tags":["ghsa","composer"],"epss":0.00366,"epssPercentile":0.30456,"ingestedAt":"2026-07-07T15:41:59.017Z","slug":"CVE-2026-47345","body":"## Overview\n\nNamespace attributes are not encoded correctly during HTML serialization. This allows bypassing the cross-site scripting prevention mechanism of `typo3/html-sanitizer` before version 2.3.2.\n\nCredits to Doyensec in collaboration with Claude and Anthropic Research for reporting this vulnerability.\n\n## Affected packages\n\n- `typo3/html-sanitizer < 2.3.2`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `typo3/html-sanitizer 2.3.2`","depth":"sunlit","depthScore":28,"depthScoreParts":{"impact":27.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}