CVE Catalog

CVE-2026-70482

HighCVSS 8.1
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.34%

26th percentile - higher than 26% of all known CVEs

Summary

Open WebUI from 0.8.0 until 0.11.0 has a vulnerability in the OAuth token exchange mechanism. When ENABLE_OAUTH_TOKEN_EXCHANGE=True, /oauth/{provider}/token/exchange accepts a raw provider access token and validates it without confirming which OAuth client the token was issued to. Anyone holding an access token for any client registered with the same provider could exchange it for an Open WebUI session as that token user.

Risk Assessment

An attacker with an access token for another application can gain unauthorized access to Open WebUI user accounts, potentially leading to data confidentiality and integrity breaches.

Recommendation

Update Open WebUI to version 0.11.0 or later. Disable token exchange if not necessary and monitor authentication logs.

Other vulnerabilities in Open WebUI

See all
Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS