LOW

GHSA-jvf5-rxvv-3mcg

TYPO3 HTML Sanitizer allows Cross-site Scripting

Quick fix

GHSA-jvf5-rxvv-3mcg — typo3/html-sanitizer: upgrade to the fixed version with the command below.

composer require typo3/html-sanitizer:^2.3.2

Details

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.

Are you affected?

Enter the version of the package you're using.

Affected packages

Packagist/typo3/html-sanitizer

Introduced in: 0Fixed in: 2.3.2

Fixcomposer require typo3/html-sanitizer:^2.3.2

References

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]