CVE-2022-36020: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

September 13, 2022 (updated September 16, 2022)

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.

References

github.com/TYPO3/html-sanitizer/commit/60bfdc7f9b394d0236e16ee4cea8372a7defa493
github.com/TYPO3/html-sanitizer/security/advisories/GHSA-47m6-46mj-p235
nvd.nist.gov/vuln/detail/CVE-2022-36020
packagist.org/packages/masterminds/html5
packagist.org/packages/typo3/html-sanitizer

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