CVE-2026-109300

4.6 MEDIUMpublic exploit available

Published 2026-10-12 · Updated 2026-10-15

AI analysis for this CVE has not been generated yet. Raw NVD data is shown below.

NVD 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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

Weaknesses

CWE-79

Public exploit & PoC references

https://github.com/open-webui/open-webui/security/advisories/GHSA-9wj4-mcm3-ppj6
https://github.com/open-webui/open-webui/security/advisories/GHSA-9wj4-mcm3-ppj6

All references

https://github.com/open-webui/open-webui/security/advisories/GHSA-9wj4-mcm3-ppj6
https://www.vulncheck.com/advisories/open-webui-0.6.31-before-0.11.4-stored-xss-via-tool-call-embeds
https://github.com/open-webui/open-webui/security/advisories/GHSA-9wj4-mcm3-ppj6

Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.

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