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CVE-2026-41427

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CVE-2026-41427

Published: Apr 24, 2026

Modified: Apr 27, 2026

PUBLISHED

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.

VendorProductVersions

better-auth

better-auth

affected
>= 1.4.8-beta.7, < 1.6.5
affected
>= 1.7.0-beta.0, <= 1.7.0-beta.1

better-auth

oauth-provider

affected
>= 1.4.8-beta.7, < 1.6.5
affected
>= 1.7.0-beta.0, <= 1.7.0-beta.1

Weaknesses (CWE)

CWE-863

References

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