CVE-2026-44476

Doorkeeper is an OAuth 2 provider for Ruby on Rails. In version 1.9.0, an attacker who knows only a dynamically registered client's client_id, which is public information, can authenticate as that client at the token endpoint and obtain an access token without providing its client_secret. This occurs because the Dynamic Client Registration feature creates applications with confidential: false hard-coded, even though the registration response returns a client_secret and advertises support for the client_secret_basic and client_secret_post authentication methods; since Doorkeeper treats a blank or missing secret as valid for non-confidential (public) clients, the secret is never verified. Only projects that have explicitly enabled Dynamic Client Registration, which is disabled by default, are affected. This issue is fixed in version 1.10.0.

CVSS

No CVSS.

References

Link	Resource
https://github.com/doorkeeper-gem/doorkeeper-openid_connect/commit/561af83dcf
https://github.com/doorkeeper-gem/doorkeeper-openid_connect/security/advisories/GHSA-m6vc-f87m-cc2h
https://github.com/doorkeeper-gem/doorkeeper-openid_connect/security/advisories/GHSA-m6vc-f87m-cc2h

Configurations

No configuration.

History

No history.

Information

Published : 2026-08-25 23:17

Updated : 2026-09-09 21:09

NVD link : CVE-2026-44476

Mitre link : CVE-2026-44476

CVE.ORG link : CVE-2026-44476

JSON object : View

Products Affected

No product.

CWE

CWE-287

Improper Authentication

CWE-1390

Weak Authentication

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