CVE-2026-70486

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.

Score

CVSS 3.1 8.2 High

Status

Analyzed - security-advisories@github.com

Published

2026-08-04

Last modified

2026-08-05

Weaknesses

CWE-1021, CWE-79

Affected products

• Open-webui (Open-webui)
• Open Webui (Openwebui)

References

• https://github.com/open-webui/open-webui/commit/65a5fad7b97db99d490d81f4e0860282c3a4543c
• 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