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.
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-47345US | — | — | ||
Namespace attributes are not encoded correctly during HTML serialization. This allows bypassing the cross-site scripting prevention mechanism of typo3/html-sanitizer before version… | ||||
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references
External citations — patches, advisories, analysis.
- https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/html-sanitizer/CVE-2026-47345.yamlWEB
- https://github.com/TYPO3/html-sanitizerPACKAGE
- https://github.com/TYPO3/html-sanitizer/commit/8b5d0be44ded457ca993ec9ca93d859941c63764WEB
- https://github.com/TYPO3/html-sanitizer/security/advisories/GHSA-p5j5-4j3q-8mq8WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-47345ADVISORY
- https://typo3.org/security/advisory/typo3-core-sa-2026-006WEB
scry
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