Vulnerability Description
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.0 until 0.11.0, the terminal file-preview serveUrl iframe branch always granted allow-same-origin together with allow-scripts for HTML files served from the application origin. Any authenticated user with access to a configured terminal server could cause script in a previewed file to run in the Open WebUI origin, read the victim's session token from localStorage, and take over the account, with possible server-side code execution if the victim was an admin or held workspace.functions. This issue is fixed in 0.11.0.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/open-webui/open-webui/commit/65a5fad7b97db99d490d81f4e0860282
- https://github.com/open-webui/open-webui/pull/26907
- https://github.com/open-webui/open-webui/releases/tag/v0.11.0
- https://github.com/open-webui/open-webui/security/advisories/GHSA-3xpf-xq7r-v8c5
FAQ
What is CVE-2026-70486?
CVE-2026-70486 is a vulnerability with a CVSS score of 8.2 (HIGH). Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.0 until 0.11.0, the terminal file-preview serveUrl iframe branch always granted allow-same-origin togethe...
How severe is CVE-2026-70486?
CVE-2026-70486 has been rated HIGH with a CVSS base score of 8.2/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-70486?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.