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EUVD-2026-216542

fkie_cve-2023-34246

Doorkeeper is an OAuth 2 provider for Ruby on Rails / Grape. Prior to version 5.6.6, Doorkeeper automatically processes authorization requests without user consent for public clients that have been previous approved. Public clients are inherently vulnerable to impersonation, their identity cannot be assured. This issue is fixed in version 5.6.6.

GHSA-7w2c-w47h-789w — Doorkeeper Improper Authentication vulnerability

Affected: RubyGems: doorkeeper

OAuth RFC 8252 says https://www.rfc-editor.org/rfc/rfc8252#section-8.6

> the authorization server SHOULD NOT process authorization requests automatically without user consent or interaction, except when the identity of the client can be assured. **This includes the case where the user has previously approved an authorization request for a given client id**

But Doorkeeper automatically processes authorization requests without user consent for public clients that have been previously approved. Public clients are inherently vulnerable to impersonation, their identity cannot be assured.

Issue https://github.com/doorkeeper-gem/doorkeeper/issues/1589

Fix https://github.com/doorkeeper-gem/doorkeeper/pull/1646

gsd-2023-34246

UBUNTU-CVE-2023-34246

Affected: Ubuntu:Pro:16.04:LTS: ruby-doorkeeper, Ubuntu:Pro:18.04:LTS: ruby-doorkeeper, Ubuntu:20.04:LTS: ruby-doorkeeper, Ubuntu:22.04:LTS: ruby-doorkeeper