{"id":"GHSA-p5j5-4j3q-8mq8","aliases":["CVE-2026-47345"],"title":"TYPO3 HTML Sanitizer allows Cross-site Scripting","description":"Namespace 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.","severity":"medium","score":5.1,"published":"2026-06-12T20:07:46.000Z","modified":"2026-09-10T03:51:09.236Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"Packagist","name":"typo3/html-sanitizer","ranges":[{"events":[{"introduced":"0"},{"fixed":"2.3.2"}],"type":"ECOSYSTEM"}],"versions":["v1.0.0","v1.0.1","v1.0.2","v1.0.3","v1.0.4","v1.0.5","v1.0.6","v1.0.7","v1.5.0","v1.5.1","v1.5.2","v1.5.3","v2.0.0","v2.0.1","v2.0.10","v2.0.11","v2.0.12","v2.0.13","v2.0.14","v2.0.15","v2.0.16","v2.0.2","v2.0.3","v2.0.4","v2.0.5","v2.0.6","v2.0.7","v2.0.8","v2.0.9","v2.1.0","v2.1.1","v2.1.2","v2.1.3","v2.1.4","v2.2.0","v2.3.0","v2.3.1"],"fixed":["2.3.2"]}],"sourceAffected":[],"references":["https://github.com/TYPO3/html-sanitizer/security/advisories/GHSA-p5j5-4j3q-8mq8","https://nvd.nist.gov/vuln/detail/CVE-2026-47345","https://github.com/TYPO3/html-sanitizer/commit/8b5d0be44ded457ca993ec9ca93d859941c63764","https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/html-sanitizer/CVE-2026-47345.yaml","https://github.com/TYPO3/html-sanitizer","https://typo3.org/security/advisory/typo3-core-sa-2026-006"],"sources":[{"name":"OSV","id":"GHSA-p5j5-4j3q-8mq8","modified":"2026-09-10T03:51:09.236719897Z","url":"https://osv.dev/vulnerability/GHSA-p5j5-4j3q-8mq8"}],"assessments":[{"source":"OSV","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","score":5.1}]}