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.
Severity (CVSS)
| Base score | 8.7 |
|---|---|
| Severity | High |
| Version | CVSS 3.1 |
| Vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N |
| Provided by | CNA |
Weaknesses
- CWE-79 — CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected products
| Vendor | Product | Versions |
|---|---|---|
| open-webui | open-webui | >= 0.10.0, < 0.11.0 |
References
- https://github.com/open-webui/open-webui/security/advisories/GHSA-pwxh-7358-jq2x (x_refsource_CONFIRM)
- https://github.com/open-webui/open-webui/pull/26718 (x_refsource_MISC)
- https://github.com/open-webui/open-webui/commit/bc600d3f085802c45aa8f38c30e6e8c986bde6cc (x_refsource_MISC)
- https://github.com/open-webui/open-webui/releases/tag/v0.11.0 (x_refsource_MISC)
Generated from the official CVE List on 05 Aug 2026 07:03 UTC.