VULNERABILITY INTELLIGENCE

CVE-2026-70482

CVSS score8.1 HIGH

EPSS probability0.57%

CISA KEVNot currently listed

Published2026-08-04

Last modified2026-09-18

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Description

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.

Weakness classification

CWE-287: Improper Authentication

Primary references

security-advisories@github.com — Patch
security-advisories@github.com — Patch
security-advisories@github.com — Release Notes
security-advisories@github.com — Exploit, Mitigation, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0 — Exploit, Mitigation, Vendor Advisory