medium6.5
CVE-2026-88005
Open WebUI: Users denied by the OAuth domain allowlist or role policy can still sign in via token exchange
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | open-webui | >= 0.8.0, < 0.9.0 | 0.9.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Openwebui | Open Webui | from 0.8.0 before 0.9.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-4qg5-cxx4-g927
- https://github.com/open-webui/open-webui/security/advisories/GHSA-4qg5-cxx4-g927
- https://github.com/open-webui/open-webui/pull/23639
- https://github.com/open-webui/open-webui/commit/fb5ef978bfb451c3f2221931e08e54250cec58ca
- https://github.com/open-webui/open-webui/releases/tag/v0.9.0