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.
CVSS breakdown
CVSS 4.0
Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
Low
User Interaction
None
Confidentiality (Vulnerable System)
None
Integrity (Vulnerable System)
High
Availability (Vulnerable System)
None
Confidentiality (Subsequent System)
None
Integrity (Subsequent System)
Low
Availability (Subsequent System)
None
Affected products
- better-auth / better-auth>= 1.4.8-beta.7, < 1.6.5 – >= 1.4.8-beta.7, < 1.6.5
- better-auth / better-auth>= 1.7.0-beta.0, <= 1.7.0-beta.1 – >= 1.7.0-beta.0, <= 1.7.0-beta.1
- better-auth / oauth-provider>= 1.4.8-beta.7, < 1.6.5 – >= 1.4.8-beta.7, < 1.6.5
- better-auth / oauth-provider>= 1.7.0-beta.0, <= 1.7.0-beta.1 – >= 1.7.0-beta.0, <= 1.7.0-beta.1