| Component | Open WebUI |
| Severity | high (CVSS 8.2) |
| CVSS vector | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N |
| Published (NVD) | 2026-08-04 |
| Last modified | 2026-09-18 |
| Affected versions | open_webui >= 0.9.0, < 0.11.0 |
| Fixed in | 0.11.0 |
| Weakness | CWE-79CWE-1021 |
| CISA KEV | not listed |
NVD 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.
What to do
- Upgrade Open WebUI to
0.11.0or later. - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2026-70486
- https://github.com/open-webui/open-webui/pull/26907
- https://github.com/open-webui/open-webui/security/advisories/GHSA-3xpf-xq7r-v8c5
- https://github.com/open-webui/open-webui/commit/65a5fad7b97db99d490d81f4e0860282c3a4543c
- https://github.com/open-webui/open-webui/releases/tag/v0.11.0
Read more
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