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.

CVSS v3 8.2 HIGH

8.2^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.8

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope CHANGED

References

Link	Resource
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

Configurations

No configuration.

History

No history.

Information

Published : 2026-08-04 20:16

Updated : 2026-09-08 20:41

NVD link : CVE-2026-70486

Mitre link : CVE-2026-70486

CVE.ORG link : CVE-2026-70486

JSON object : View

Products Affected

No product.

CWE

CWE-79

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CWE-1021

Improper Restriction of Rendered UI Layers or Frames

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