XSS in Typo3 Html-Sanitizer
CVE-2022-36020
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 class: XSS (Cross-Site Scripting)
EPSS: 0.007 (47.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
Affected products
- Typo3 Html-sanitizer — versions >= 1.0.0, < 1.0.7, >= 2.0.0, < 2.0.16
- Typo3 Html_sanitizer
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Third Party Advisory)
- security-advisories@github.com (Patch, Third Party Advisory, x_refsource_MISC)
- security-advisories@github.com (Third Party Advisory, x_refsource_MISC)
- security-advisories@github.com (Product, Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2022-36020?
- CVE-2022-36020 is a medium-severity vulnerability in Typo3 Html-Sanitizer, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2022-09-13.
- How severe is CVE-2022-36020?
- Medium severity. CVSS v3 base score is 6.1 out of 10.
- Is CVE-2022-36020 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.