CVE-2026-41427
CVE-2026-41427 · Better Auth OAuth 2.1 Provider: Unprivileged users can register OAuth clients
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 7.1 · High · EPSS 0.2% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
better-auth
- Versions
- >= 1.4.8-beta.7, < 1.6.5: Affected
- >= 1.7.0-beta.0, <= 1.7.0-beta.1: Affected
No fix published
oauth-provider
- Versions
- >= 1.4.8-beta.7, < 1.6.5: Affected
- >= 1.7.0-beta.0, <= 1.7.0-beta.1: Affected
No fix published
@better-auth/oauth-provider npm
- Affected ranges
- SEMVER: ≥ 1.4.8-beta.7, < 1.6.5
Update to 1.6.5
@better-auth/oauth-provider npm
- Affected ranges
- SEMVER: ≥ 1.7.0-beta.0, ≤ 1.7.0-beta.1
No fix published