---
id: CVE-2026-109283
title: >-
  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 foun…
summary: >-
  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 foun…
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N'
cwe:
  - CWE-863
published: '2026-10-12'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T20:39:48.767'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-109283'
references:
  - url: >-
      https://github.com/open-webui/open-webui/security/advisories/GHSA-2rr4-q6pg-m5g3
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/open-webui-0.11.1-before-0.11.4-authorization-bypass-via-oauth-token-exchange
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/open-webui/open-webui/security/advisories/GHSA-2rr4-q6pg-m5g3
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00251
epssPercentile: 0.16422
ingestedAt: '2026-10-12T18:00:08.187Z'
vendor: open-webui
product: open-webui
affected:
  - open-webui >= 0.11.1 < 0.11.4
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-13T15:37:20.530379Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.