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Open WebUI: Stored XSS via unescaped KaTeX render-error fallback in rendered messages

🗓️ 04 Aug 2026 20:54:17Reported by GitHub Advisory DatabaseType 
github
 github
🔗 github.com👁 2 Views

Summary Any authenticated user can store a chat message whose math block makes KaTeX fail with a stack overflow instead of a parse error. When that happens the renderer falls back to inserting the original math source into the page as HTML rather ...

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04 Aug 2026 20:54Current
5.6Medium risk
Vulners AI Score5.6
CVSS 3.18.7
2