| Component | Open WebUI |
| Severity | medium (CVSS 6.5) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N |
| Published (NVD) | 2026-09-10 |
| Last modified | 2026-09-18 |
| Affected versions | open_webui >= 0.8.0, < 0.9.0 |
| Fixed in | 0.9.0 |
| Weakness | CWE-863 |
| CISA KEV | not listed |
NVD description
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.8.0 until 0.9.0, Open WebUI's OAuth token exchange endpoint issues a session for a provider access token without applying the email domain allowlist that the normal OAuth login callback enforces. An account whose email domain the login callback would refuse could still obtain a working session through this endpoint. This issue is fixed in version 0.9.0.
What to do
- Upgrade Open WebUI to
0.9.0or later. - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2026-88005
- https://github.com/open-webui/open-webui/security/advisories/GHSA-4qg5-cxx4-g927
- https://github.com/open-webui/open-webui/commit/fb5ef978bfb451c3f2221931e08e54250cec58ca
- https://github.com/open-webui/open-webui/pull/23639
Read more
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