CVE-2026-47345: TYPO3 HTML Sanitizer allows Cross-site Scripting
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.
Credits to Doyensec in collaboration with Claude and Anthropic Research for reporting this vulnerability.
References
- github.com/FriendsOfPHP/security-advisories/blob/master/typo3/html-sanitizer/CVE-2026-47345.yaml
- github.com/TYPO3/html-sanitizer/commit/8b5d0be44ded457ca993ec9ca93d859941c63764
- github.com/TYPO3/html-sanitizer/security/advisories/GHSA-p5j5-4j3q-8mq8
- github.com/advisories/GHSA-p5j5-4j3q-8mq8
- nvd.nist.gov/vuln/detail/CVE-2026-47345
- typo3.org/security/advisory/typo3-core-sa-2026-006
Code Behaviors & Features
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