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CVE-2024-28246: KaTeX is missing normalization of the protocol in URLs allows bypassing forbidden protocols

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-03-25 · updated 2026-06-17
• Weakness: CWE-184

Description

KaTeX is a JavaScript library for TeX math rendering on the web. Code that uses KaTeX's `trust` option, specifically that provides a function to blacklist certain URL protocols, can be fooled by URLs in malicious inputs that use uppercase characters in the protocol. In particular, this can allow for malicious input to generate `javascript:` links in the output, even if the `trust` function tries to forbid this protocol via `trust: (context) => context.protocol !== 'javascript'`. Upgrade to KaTeX v0.16.10 to remove this vulnerability.

Affected products

• KaTeX: from 0.11.0 before 0.16.10 — fixed in 0.16.10

How to fix

Upgrade to a fixed version: KaTeX 0.16.10. Check the vendor advisory for mitigations.

References

• https://github.com/KaTeX/KaTeX/commit/fc5af64183a3ceb9be9d1c23a275999a728593de
• https://github.com/KaTeX/KaTeX/security/advisories/GHSA-3wc5-fcw2-2329
• https://github.com/KaTeX/KaTeX/commit/fc5af64183a3ceb9be9d1c23a275999a728593de
• https://github.com/KaTeX/KaTeX/security/advisories/GHSA-3wc5-fcw2-2329

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