What’s Vulnerable › Vulnerabilities

CVE-2022-36020: Bypass of Cross-Site Scripting Protection in typo3/html-sanitizer

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-09-13 · updated 2026-06-17
• Weakness: CWE-79

Description

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; from 2.0.0 before 2.0.16 — fixed in 1.0.7, 2.0.16

How to fix

Upgrade to a fixed version: TYPO3 html-sanitizer 1.0.7, 2.0.16. Check the vendor advisory for mitigations.

References

• https://github.com/TYPO3/html-sanitizer/commit/60bfdc7f9b394d0236e16ee4cea8372a7defa493
• https://github.com/TYPO3/html-sanitizer/security/advisories/GHSA-47m6-46mj-p235
• https://packagist.org/packages/masterminds/html5
• https://packagist.org/packages/typo3/html-sanitizer
• https://github.com/TYPO3/html-sanitizer/commit/60bfdc7f9b394d0236e16ee4cea8372a7defa493
• https://github.com/TYPO3/html-sanitizer/security/advisories/GHSA-47m6-46mj-p235
• https://packagist.org/packages/masterminds/html5
• https://packagist.org/packages/typo3/html-sanitizer

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