CVE-2026-109300 — Open WebUI 0.6.31 before 0.11.4 Stored XSS via Tool-Call Embeds
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 o…
Published: 2026-10-12 · CVSS: 5.1 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7