Description
Open WebUI from 0.6.31 before 0.11.4 contains a stored cross-site scripting vulnerability in its Markdown renderer, which treats user-authored tool-call details blocks as tool output and mounts their embeds attribute in script-enabled iframes. Authenticated users can post crafted channel messages, chat messages, or citation content that runs JavaScript in viewers' browsers, enabling in-app phishing, or session hijacking where iframeSandboxAllowSameOrigin is enabled.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| open-webui | open-webui | 0.6.31 – < 0.11.4 | 0.11.4 |
References
- GitHub Security Advisory (GHSA-9wj4-mcm3-ppj6) vendor-advisory
- VulnCheck Advisory: Open WebUI 0.6.31 before 0.11.4 Stored XSS via Tool-Call Embeds third-party-advisory