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.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-44476)

Note that Nessus relies on the presence of the package as reported by the vendor.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2026-44476)

ID	Name	Product	Family	Type	Severity
340708	Linux Distros Unpatched Vulnerability : CVE-2026-44476	Nessus	Misc.	Local	medium
442639	SCA: security update for doorkeeper-openid_connect (GHSA-m6vc-f87m-cc2h)	Tenable Cloud Security	SCA Checks	Local	medium
442639	SCA: security update for doorkeeper-openid_connect (GHSA-m6vc-f87m-cc2h)	Tenable Self-Hosted Container Security	SCA Checks	Local	medium

Detections

Analytics

CVE-2026-44476

medium

Tenable Plugins

medium

medium

medium