{"items":[{"id":"NVI-00018368","kind":"vulnerability","title":"Doorkeeper Openid Connect: Dynamic Client Registration feature creates public clients with client_secret","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-m6vc-f87m-cc2h","CVE-2026-44476"],"plain_summary":"GitHub lists this reviewed advisory for doorkeeper-openid_connect. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-17ab590ba21746cd0151ac98345334a3"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-17ab590ba21746cd0151ac98345334a3","url":"https://github.com/advisories/GHSA-m6vc-f87m-cc2h","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-m6vc-f87m-cc2h","publisher":"GitHub Advisory Database","observed_at":"2026-11-06T20:56:39.448Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-17ab590ba21746cd0151ac98345334a3"],"technology":"doorkeeper-openid_connect","known_exclusions":[],"conditions_summary":"### Impact\n\nThe `DynamicClientRegistrationController#register` action hard-codes `confidential: false` when creating applications (dynamic_client_registration_controller.rb:18-25), yet the response includes a client_secret and advertises `token_endpoint_auth_methods_supported: [\"client_secret_basic\", \"client_secret_post\"]`.\n\nBecause Doorkeeper's `Application.by_uid_and_secret` treats a blank/missing secret as valid for non-confidential (public) clients, an\nattacker who knows only the client_id (which is public information) can authenticate as the dynamically-registered client at the token endpoint.\n\n**Note** that Dynamic Client Registration is opt-in feature which is disabled by default so only projects that explicitly enabled it are affected.\n\n**Steps to Reproduce**\n\n1. Enable dynamic client registration in the initializer\n2. POST /oauth/registration with client_name, redirect_uris, and scope\n3. Observe: response returns client_secret, but the created\nDoorkeeper::Application has confidential: false\n4. Call `Doorkeeper::Application.by_uid_and_secret(client_id, nil)` — it\nreturns the application (credentials bypass)\n5. POST /oauth/token with grant_type=client_credentials and only\ncl","public_affected_ranges":["= 1.9.0"]}],"null_published_at":"2026-11-07T07:07:39.825Z","source_updated_at":"2026-06-09T11:57:56.000Z","source_disclosed_at":"2026-06-04T14:37:11.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-11-06T20:56:39.448Z"}],"next_cursor":null,"snapshot_revision":"42594"}