VEXID-9283308
Published 2026-08-25 23:17:58
Last Modified 2026-08-25 23:17:58
AKA CVE-2026-70665
Summary Doorkeeper OpenID Connect implements an OpenID Connect authentication provider for Rails applications on top of Doorkeeper. Prior to 1.10.4, the Dynamic Client Registration (DCR) endpoint persists client-supplied scopes without validating them against the server's configured scope set. Under certain conditions, this allows a self-registered client to obtain scopes beyond what the server intended to grant. In DynamicClientRegistrationController#application_params, the scopes attribute is assigned directly from params[:scope] with no validation against Doorkeeper.configuration.scopes or optional_scopes. Combined with enforce_configured_scopes being off by default and Doorkeeper's ScopeChecker prioritizing application-level scopes over server-level scopes, this creates a privilege escalation path. This issue is fixed in version 1.10.4.
CVSS
Access Vector Local Adjacent Network
Access Complexity Low Medium High
Authentication None Single Multiple
Confidentiality None Partial Complete
Integrity None Partial Complete
Availability None Partial Complete