XSS in TYPO3 Html-Sanitizer
CVE-2022-23499
HTML sanitizer is written in PHP, aiming to provide XSS-safe markup based on explicitly allowed tags, attributes and values. In versions prior to 1.5.0 or 2.1.1, malicious markup used in a sequence with special HTML CDATA sections cannot be filtered and sanitized due to a parsing issue in the upstream package masterminds/html5. This allows bypassing the cross-site scripting mechanism of typo3/html-sanitizer. The upstream package masterminds/html5 provides HTML raw text elements (`script`, `style`, `noframes`, `noembed` and `iframe`) as DOMText nodes, which were not processed and sanitized further. None of the mentioned elements were defined in the default builder configuration, that's why only custom behaviors, using one of those tag names, were vulnerable to cross-site scripting. This issue has been fixed in versions 1.5.0 and 2.1.1.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.005 (36.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 36.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.000
Affected products
- TYPO3 Html-Sanitizer — versions >= 1.0.0, < 1.5.0, >= 2.0.0, < 2.1.1
- TYPO3 HTML Sanitizer
Weakness classification (CWE)
References
- github.com/TYPO3/html-sanitizer/security/advisories/GHSA-hvwx-qh2h-xcfj (Third Party Advisory)
Frequently asked questions
- What is CVE-2022-23499?
- CVE-2022-23499 is a medium-severity vulnerability in TYPO3 Html-Sanitizer, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2022-12-13.
- How severe is CVE-2022-23499?
- Medium severity. CVSS v3 base score is 6.1 out of 10.