GitHub Advisoryadvisory · Packagist
GHSA-p5j5-4j3q-8mq8 TYPO3 HTML Sanitizer allows Cross-site Scripting
MEDIUM
Official page ↗
- Aliases
- CVE-2026-47345
- Ecosystem
- Packagist
- Packages
- typo3/html-sanitizer
- Severity
- Moderate
- CVSS 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
- Weaknesses
- CWE-79
- Reviewed
- 2026-06-12
Affected packages
• Packagist typo3/html-sanitizer: < 2.3.2 → fixed in 2.3.2
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.
Related
Alias · CVE (1)
- CVE-2026-47345 Namespace attributes are not encoded correctly during HTML serialization. vulnerability
Weakness · CWE (1)
- CWE-79 Improper Neutralization of Input During Web Page Generation weakness
References
- https://github.com/TYPO3/html-sanitizer/security/advisories/GHSA-p5j5-4j3q-8mq8 web
- https://nvd.nist.gov/vuln/detail/CVE-2026-47345 advisory
- https://github.com/TYPO3/html-sanitizer/commit/8b5d0be44ded457ca993ec9ca93d859941c63764 web
- https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/html-sanitizer/CVE-2026-47345.yaml web
- https://github.com/TYPO3/html-sanitizer package
- https://typo3.org/security/advisory/typo3-core-sa-2026-006 web