CVE-2026-109300 | BDVDB-2026-386346 Detail

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.

Impact#

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Exploit#

History#

1. Version 12026-10-12Record published in the CVE List.
2. Version 22026-10-13Most recent update recorded in the CVE List.