- Component Type: TYPO3 CMS
- Subcomponent: HTML Sanitizer (based on typo3/html-sanitizer)
- Release Date: December 13, 2022
- Vulnerability Type: Cross-Site Scripting
- Affected Versions: 8.0.0-8.7.48, 9.0.0-9.5.37, 10.0.0-10.4.32, 11.0.0-11.5.19, 12.0.0-12.1.0
- Severity: Medium
- Suggested CVSS: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:F/RL:O/RC:C
- References: CVE-2022-23499, CWE-79
Due to a parsing issue in the upstream package masterminds/html5, malicious markup used in a sequence with special HTML CDATA sections cannot be filtered and sanitized. This allows bypassing the cross-site scripting mechanism of typo3/html-sanitizer.
Besides that, the upstream package masterminds/html5 provides HTML raw text elements (script, style, noframes, noembed and iframe) as DOMText nodes, which were not processed and sanitized further. None of the mentioned elements were defined in the default builder configuration, that's why only custom behaviors, using one of those tag names, were vulnerable to cross-site scripting.
Update to TYPO3 versions 8.7.49 ELTS, 9.5.38 ELTS, 10.4.33, 11.5.20, 12.1.1 that fix the problem described above.
Thanks to David Klein who reported this issue, and to TYPO3 core & security team member Oliver Hader who fixed the issue.
All security related code changes are tagged so that you can easily look them up in our review system.