Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.5, the clientPrivileges option documents a create action, but the OAuth client creation endpoints did not invoke the hook before persisting new clients. Deployments that configured clientPrivileges to restrict client registration were not actually restricted — any authenticated user could reach the create endpoints and register an OAuth client with attacker-chosen redirect URIs and metadata. This vulnerability is fixed in 1.6.5.
History

Tue, 28 Apr 2026 09:45:00 +0000

Type Values Removed Values Added
First Time appeared Better-auth
Better-auth better Auth
Better-auth oauth-provider
Vendors & Products Better-auth
Better-auth better Auth
Better-auth oauth-provider

Mon, 27 Apr 2026 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 24 Apr 2026 19:45:00 +0000

Type Values Removed Values Added
Description Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.5, the clientPrivileges option documents a create action, but the OAuth client creation endpoints did not invoke the hook before persisting new clients. Deployments that configured clientPrivileges to restrict client registration were not actually restricted — any authenticated user could reach the create endpoints and register an OAuth client with attacker-chosen redirect URIs and metadata. This vulnerability is fixed in 1.6.5.
Title Better Auth OAuth 2.1 Provider: Unprivileged users can register OAuth clients
Weaknesses CWE-863
References
Metrics cvssV4_0

{'score': 7.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:L/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-04-24T19:23:20.161Z

Updated: 2026-04-27T13:42:23.885Z

Reserved: 2026-04-20T15:32:33.814Z

Link: CVE-2026-41427

cve-icon Vulnrichment

Updated: 2026-04-27T13:42:19.429Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-04-24T20:16:27.390

Modified: 2026-04-27T18:57:20.293

Link: CVE-2026-41427

cve-icon Redhat

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