CVE-2022-36020: TYPO3 Html Sanitizer

Medium severity, CVSS 6.1. EPSS: 0.8% chance of exploitation in the next 30 days.

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.

Affected products

• TYPO3 Html Sanitizer: from 1.0.0, before 1.0.7 (fixed in 1.0.7); from 2.0.0, before 2.0.16 (fixed in 2.0.16)

Published 2022-09-13. Last modified 2026-06-17.