CVE-2025-23207: \htmlData does not validate attribute names in KaTeX
Description
KaTeX is a fast, easy-to-use JavaScript library for TeX math rendering on the web. KaTeX users who render untrusted mathematical expressions with `renderToString` could encounter malicious input using `\htmlData` that runs arbitrary JavaScript, or generate invalid HTML. Users are advised to upgrade to KaTeX v0.16.21 to remove this vulnerability. Users unable to upgrade should avoid use of or turn off the `trust` option, or set it to forbid `\htmlData` commands, forbid inputs containing the substring `"\\htmlData"` and sanitize HTML output from KaTeX.
Classification
CVE ID: CVE-2025-23207
CVSS Base Severity: MEDIUM
CVSS Base Score: 6.3
Affected Products
Vendor: KaTeX
Product: KaTeX
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.04% (probability of being exploited)
EPSS Percentile: 11.66% (scored less or equal to compared to others)
EPSS Date: 2025-02-15 (when was this score calculated)
References
https://github.com/KaTeX/KaTeX/security/advisories/GHSA-cg87-wmx4-v546https://github.com/KaTeX/KaTeX/commit/ff289955e81aab89086eef09254cbf88573d415c