XSS Sanitizer Bypass in typo3/html-sanitizer v1.0.7/2.0.16
CVE-2022-36020 Published on September 13, 2022
Bypass of Cross-Site Scripting Protection in typo3/html-sanitizer
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.
Vulnerability Analysis
CVE-2022-36020 is exploitable with network access, requires user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality and integrity, and no impact on availability.
Weakness Type
What is a XSS Vulnerability?
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
CVE-2022-36020 has been classified to as a XSS vulnerability or weakness.
Products Associated with CVE-2022-36020
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Affected Versions
TYPO3 html-sanitizer:- Version >= 1.0.0, < 1.0.7 is affected.
- Version >= 2.0.0, < 2.0.16 is affected.
Vulnerable Packages
The following package name and versions may be associated with CVE-2022-36020
| Package Manager | Vulnerable Package | Versions | Fixed In |
|---|---|---|---|
| composer | typo3/html-sanitizer | >= 1.0.0, < 1.0.7 | 1.0.7 |
| composer | typo3/html-sanitizer | >= 2.0.0, < 2.0.16 | 2.0.16 |
| composer | typo3/cms-core | >= 10.0.0, < 10.4.32 | 10.4.32 |
| composer | typo3/cms-core | >= 11.0.0, < 11.5.16 | 11.5.16 |
| composer | typo3/cms | >= 10.0.0, < 10.4.32 | 10.4.32 |
| composer | typo3/cms | >= 11.0.0, < 11.5.16 | 11.5.16 |
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.