Cross-Site Scripting in markdown-it-katex

Description

All versions of markdown-it-katex are vulnerable to Cross-Site Scripting (XSS). The package fails to properly escape error messages, which may allow attackers to execute arbitrary JavaScript in a victim’s browser by triggering an error.

Recommendation

No fix is available yet. Followings are affected versions:

• >= 0.0.0

References

• GHSA-5ff8-jcf9-fw62
• www.npmjs.com
• CWE-79
• OWASP 2021-A3

Related Issues

• Cross-Site Scripting in markdown-to-jsx - markdown-to-jsx - Vulnerability
• Astro Cloudflare adapter has Stored Cross-site Scripting vulnerability in /_image endpoint - CVE-2025-65019
• Parse Server has a Cross-Site Scripting (XSS) vulnerability via Unescaped Mustache Template Variables - CVE-2025-68115
• Bootstrap Cross-site Scripting vulnerability - bootstrap - GHSA-pj7m-g53m-7638 - CVE-2018-14041

You might also like:

How to Secure your NodeJs Express Javascript Application - part 1

How to Secure your NodeJs Express Javascript Application - part 2

10 Secure Coding Best Practices to Follow in Every Project

Tags:

npm

markdown-it-katex