Open WebUI: Same-origin XSS to account takeover via terminal file-preview iframe hardcoding allow-same-origin

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-70486
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-04 20:16:55 UTC
Updated2026-08-04 20:16:55 UTC
DescriptionOpen 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.

Risk And Classification

Primary CVSS: v3.1 8.2 HIGH from [email protected]

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

Problem Types: CWE-79 | CWE-1021 | CWE-79 CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | CWE-1021 CWE-1021: Improper Restriction of Rendered UI Layers or Frames

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.2HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
3.1CNADECLARED8.2HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Open-webui Open-webui affected >= 0.9.0, < 0.11.0 Not specified

References

ReferenceSourceLinkTags
github.com/open-webui/open-webui/pull/26907 [email protected] github.com
github.com/open-webui/open-webui/security/advisories/GHSA-3xpf-xq7r-v8c5 [email protected] github.com
github.com/open-webui/open-webui/releases/tag/v0.11.0 [email protected] github.com
github.com/open-webui/open-webui/commit/65a5fad7b97db99d490d81f4e0860282... [email protected] github.com
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