Headline
GHSA-47m6-46mj-p235: TYPO3 HTML Sanitizer Bypasses Cross-Site Scripting Protection
Meta
- 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(5.7)
Problem
Due to a parsing issue in upstream package masterminds/html5, malicious markup used in a sequence with special HTML comments cannot be filtered and sanitized. This allows to by-pass the cross-site scripting mechanism of typo3/html-sanitizer.
Solution
Update to typo3/html-sanitizer versions 1.0.7 or 2.0.16 that fix the problem described.
Credits
Thanks to David Klein who reported this issue, and to TYPO3 security team member Oliver Hader who fixed the issue.
Package
Affected versions
>= 10.0.0, < 10.4.32
>= 11.0.0, < 11.5.16
Patched versions
10.4.32
11.5.16
>= 10.0.0, < 10.4.32
>= 11.0.0, < 11.5.16
composer typo3/html-sanitizer (Composer)
>= 1.0.0, < 1.0.7
>= 2.0.0, < 2.0.16
Related news
The typo3/html-sanitizer package is an HTML sanitizer, written in PHP, aiming to provide XSS-safe markup based on explicitly allowed tags, attributes and values. Due to a parsing issue in the upstream package `masterminds/html5`, malicious markup used in a sequence with special HTML comments cannot be filtered and sanitized. This allows for a bypass of the cross-site scripting mechanism of `typo3/html-sanitizer`. This issue has been addressed in versions 1.0.7 and 2.0.16 of the `typo3/html-sanitizer` package. Users are advised to upgrade. There are no known workarounds for this issue.