CVE-2026-70482
highOpen WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform.
Vendor / product: Openwebui — open webui
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.8.0 until 0.11.0, when ENABLE_OAUTH_TOKEN_EXCHANGE=True, /oauth/{provider}/token/exchange accepts a raw provider access token and validates it by calling the provider userinfo endpoint without confirming which OAuth client the token was issued to. Anyone holding an access token minted for any client registered with the same provider could exchange it for an Open WebUI session as that token user, including applications the operator does not control and has never authorized. This issue is fixed in 0.11.0.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Affected products
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
References
- https://github.com/open-webui/open-webui/commit/b190dcf3caa00dc8b7b9c7312828298d9143f60d security-advisories@github.com
- https://github.com/open-webui/open-webui/commit/c4332be71e6e9c314e8a13b9d2819a6932561630 security-advisories@github.com
- https://github.com/open-webui/open-webui/releases/tag/v0.11.0 security-advisories@github.com
- https://github.com/open-webui/open-webui/security/advisories/GHSA-rq84-p6rr-vf89 security-advisories@github.com
- https://github.com/open-webui/open-webui/security/advisories/GHSA-rq84-p6rr-vf89 134c704f-9b21-4f2e-91b3-4a467353bcc0