CVE Catalog

CVE-2026-70492

HighCVSS 8.7
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.26%

18th percentile - higher than 18% of all known CVEs

Summary

In Open WebUI from 0.10.0 until 0.11.0, the KatexRenderer.svelte component could store and render a chat message whose math block makes KaTeX fail with a stack overflow instead of a parse error. The catch branch inserted the original math source into the page as HTML through {@html}, allowing script execution in the browser of anyone who views the message, including shared chats and channels. The viewer's session token can be stolen, and an administrator viewer can have their account taken over.

Risk Assessment

An attacker can execute arbitrary script in the victim's browser, potentially leading to session theft, administrator account takeover, and data confidentiality breach.

Recommendation

Upgrade Open WebUI to version 0.11.0 immediately, which contains the fix. Also avoid opening suspicious messages in shared chats.

Other vulnerabilities in Open WebUI

See all
Original NVD description (English source)

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.10.0 until 0.11.0, src/lib/components/chat/Messages/Markdown/KatexRenderer.svelte could store and render a chat message whose math block makes KaTeX fail with a stack overflow instead of a parse error. The catch branch fell back to inserting the original math source into the page as HTML through {@html} rather than as text, so script in the message runs in the browser of whoever views it, including shared chats and channels. The viewer's session token in localStorage can be stolen, and an administrator viewer can have their account taken over. This issue is fixed in 0.11.0.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS