CVE-2026-70482 (GCVE-0-2026-70482)
Vulnerability from cvelistv5
Published
2026-08-04 19:51
Modified
2026-08-06 03:55
Severity ?
8.1 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
CWE
  • CWE-287 - Improper Authentication
Summary
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.
References
Impacted products
Vendor Product Version
open-webui open-webui Version: >= 0.8.0, < 0.11.0
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