typo3/html-sanitizer · Security
TYPO3 HTML Sanitizer allows Cross-site Scripting
- GHSA ID
- GHSA-p5j5-4j3q-8mq8
- CVE ID
- CVE-2026-47345
- Severity
- medium
- Published
- Updated
- CVSS v4
- 5.1 · 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
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.
Credits to Doyensec in collaboration with Claude and Anthropic Research for reporting this vulnerability.
CWEs
- CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
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://typo3.org/security/advisory/typo3-core-sa-2026-006 ↗
- https://github.com/advisories/GHSA-p5j5-4j3q-8mq8 ↗