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CVE-2026-109300

5.1 medium SSVC exploitation: poc Awaiting Analysis
NVD · CVE.org

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.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 2

  1. StatusReceived → Awaiting AnalysisNVD modified 2026-10-15 15:55
  2. First seenCVSS 5.1NVD modified 2026-10-13 19:18

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 3