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.
Metrics
Affected Vendors & Products
References
History
Wed, 05 Aug 2026 15:30:00 +0000
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ssvc
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Tue, 04 Aug 2026 23:00:00 +0000
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Open-webui
Open-webui open-webui |
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Open-webui
Open-webui open-webui |
Tue, 04 Aug 2026 21:15:00 +0000
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| Description | 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. | |
| Title | Open WebUI: Stored XSS via unescaped KaTeX render-error fallback in rendered messages | |
| Weaknesses | CWE-79 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-08-05T14:41:30.187Z
Reserved: 2026-08-04T15:24:41.340Z
Link: CVE-2026-70492
Updated: 2026-08-05T14:40:56.562Z
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OpenCVE Enrichment
Updated: 2026-08-04T22:45:03Z