CVE-2026-109283

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.

CVSS v3 5.4 MEDIUM

5.4^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 2.5

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/open-webui/open-webui/security/advisories/GHSA-2rr4-q6pg-m5g3
https://www.vulncheck.com/advisories/open-webui-0.11.1-before-0.11.4-authorization-bypass-via-oauth-token-exchange
https://github.com/open-webui/open-webui/security/advisories/GHSA-2rr4-q6pg-m5g3

Configurations

No configuration.

History

13 Oct 2026, 16:17

Type	Values Removed	Values Added
References	~~() https://github.com/open-webui/open-webui/security/advisories/GHSA-2rr4-q6pg-m5g3 -~~	() https://github.com/open-webui/open-webui/security/advisories/GHSA-2rr4-q6pg-m5g3 -

12 Oct 2026, 17:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-12 17:17

Updated : 2026-10-13 20:39

NVD link : CVE-2026-109283

Mitre link : CVE-2026-109283

CVE.ORG link : CVE-2026-109283

JSON object : View

Products Affected

No product.

CWE

CWE-863

Incorrect Authorization

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