Vulnerability · Published Oct 12, 2026 · Assigned by VulnCheck

CVE-2026-109283Open WebUI 0.11.1 before 0.11.4 Authorization Bypass via OAuth Token Exchange

Medium 5.4

In plain English

A medium-severity incorrect authorization in open-webui from open-webui. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities).

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.3%top 83.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Open WebUI from 0.11.1 before 0.11.4 contains an authorization bypass in the OAuth token exchange endpoint, which reads role claims only from the provider's userinfo response and keeps the user's existing role when no roles claim is found, ignoring roles sent only in the ID token. Users with a linked account whose identity provider role no longer satisfies the OAuth role policy can send a valid provider access token to POST /api/v1/auths/oauth/{provider}/token/exchange to obtain a session retaining their previous role.

Affected products (as reported)

Vendor	Product	Versions
open-webui	open-webui	0.11.1 – before 0.11.4

Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

References

GitHub Security Advisory (GHSA-2rr4-q6pg-m5g3) vendor-advisory
VulnCheck Advisory: Open WebUI 0.11.1 before 0.11.4 Authorization Bypass via OAuth Token Exchange third-party-advisory