{"id":"GHSA-p5j5-4j3q-8mq8","summary":"TYPO3 HTML Sanitizer allows Cross-site Scripting","details":"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.","aliases":["CVE-2026-47345"],"modified":"2026-09-10T03:51:09.236719897Z","published":"2026-06-12T20:07:46Z","database_specific":{"github_reviewed":true,"github_reviewed_at":"2026-06-12T20:07:46Z","nvd_published_at":"2026-06-08T20:17:01Z","cwe_ids":["CWE-79"],"severity":"MODERATE"},"references":[{"type":"WEB","url":"https://github.com/TYPO3/html-sanitizer/security/advisories/GHSA-p5j5-4j3q-8mq8"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-47345"},{"type":"WEB","url":"https://github.com/TYPO3/html-sanitizer/commit/8b5d0be44ded457ca993ec9ca93d859941c63764"},{"type":"WEB","url":"https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/html-sanitizer/CVE-2026-47345.yaml"},{"type":"PACKAGE","url":"https://github.com/TYPO3/html-sanitizer"},{"type":"WEB","url":"https://typo3.org/security/advisory/typo3-core-sa-2026-006"}],"affected":[{"package":{"name":"typo3/html-sanitizer","ecosystem":"Packagist","purl":"pkg:composer/typo3/html-sanitizer"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.3.2"}]}],"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"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-p5j5-4j3q-8mq8/GHSA-p5j5-4j3q-8mq8.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}