GHSA-jvf5-rxvv-3mcg

TYPO3 HTML Sanitizer allows Cross-site Scripting

Source: GitHub Advisory Database (reviewed) Low CVE-2026-47344

Packages

Ecosystem	Package	Affected	Fixed in
Packagist	typo3/html-sanitizer	< 2.3.2	2.3.2

Details

As written in the advisory (Markdown source, shown as plain text).

When `ALLOW_INSECURE_RAW_TEXT` is enabled, whitespace-variant closing tags (e.g., `</style\\t>`) are not recognized by the sanitizer but accepted by browsers as valid end tags, allowing subsequent content to escape sanitization. This allows bypassing the cross-site scripting prevention mechanism of `typo3/html-sanitizer` before version 2.3.2. Credits to IPC Labs for reporting this vulnerability.

References

External links from the advisory. They lead to third-party sites.

https://github.com/TYPO3/html-sanitizer/security/advisories/GHSA-jvf5-rxvv-3mcg web
https://nvd.nist.gov/vuln/detail/CVE-2026-47344 advisory
https://github.com/TYPO3/html-sanitizer/commit/bd1a88d9b5a5f67f1120ec41084e9c1a0675641c web
https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/html-sanitizer/CVE-2026-47344.yaml web
https://github.com/TYPO3/html-sanitizer package
https://typo3.org/security/advisory/typo3-core-sa-2026-006 web