CVE-2026-70486CWE-1021CWE-79cross-site-scripting

CVE-2026-70486

High · published August 5, 2026

CVSS v3.1
8.2
EPSS
0%
Percentile
30.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.2 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00380 · 30.7th percentile
Weaknesses
CWE-1021 · Improper Restriction of Rendered UI Layers or Frames; CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-08-05T00:16Z
Affected products (1)
ProductVersionsFixed in
openwebui/open_webui≥ 0.9.0, < 0.11.00.11.0
References (4)
https://github.com/open-webui/open-webui/commit/65a5fad7b97db99d490d81f4e0860282c3a4543c · [email protected]https://github.com/open-webui/open-webui/pull/26907 · [email protected]https://github.com/open-webui/open-webui/releases/tag/v0.11.0 · [email protected]https://github.com/open-webui/open-webui/security/advisories/GHSA-3xpf-xq7r-v8c5 · [email protected]
EPSS history
Timeline
  • 04 AUG 20:01Z
    Open WebUI: Same-origin XSS to account takeover via terminal file-preview iframe hardcoding allow-same-origin
    cvelistv5