typo3/html-sanitizer · Security
TYPO3 HTML Sanitizer allows Cross-site Scripting
- GHSA ID
- GHSA-jvf5-rxvv-3mcg
- CVE ID
- CVE-2026-47344
- Severity
- low
- Published
- Updated
- CVSS v4
- 2.1 · CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Description
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.
CWEs
- CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
References
- https://github.com/TYPO3/html-sanitizer/security/advisories/GHSA-jvf5-rxvv-3mcg ↗
- https://nvd.nist.gov/vuln/detail/CVE-2026-47344 ↗
- https://github.com/TYPO3/html-sanitizer/commit/bd1a88d9b5a5f67f1120ec41084e9c1a0675641c ↗
- https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/html-sanitizer/CVE-2026-47344.yaml ↗
- https://typo3.org/security/advisory/typo3-core-sa-2026-006 ↗
- https://github.com/advisories/GHSA-jvf5-rxvv-3mcg ↗