UBUNTU-CVE-2026-44476

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Source
https://ubuntu.com/security/CVE-2026-44476
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44476.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-44476
Upstream
Published
2026-08-25T23:17:00Z
Modified
2026-09-02T19:34:27Z
Severity
  • 6.3 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

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.

References

Affected packages

Ubuntu:18.04:LTS
ruby-doorkeeper-openid-connect

Package

Name
ruby-doorkeeper-openid-connect
Purl
pkg:deb/ubuntu/ruby-doorkeeper-openid-connect?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.1.2-1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "ruby-doorkeeper-openid-connect",
            "binary_version":  "1.1.2-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44476.json"
Ubuntu:20.04:LTS
ruby-doorkeeper-openid-connect

Package

Name
ruby-doorkeeper-openid-connect
Purl
pkg:deb/ubuntu/ruby-doorkeeper-openid-connect?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.5.5-1
1.6.3-2

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "ruby-doorkeeper-openid-connect",
            "binary_version":  "1.6.3-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44476.json"
Ubuntu:22.04:LTS
ruby-doorkeeper-openid-connect

Package

Name
ruby-doorkeeper-openid-connect
Purl
pkg:deb/ubuntu/ruby-doorkeeper-openid-connect?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.7.4-2
1.8.0-1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "ruby-doorkeeper-openid-connect",
            "binary_version":  "1.8.0-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44476.json"
Ubuntu:24.04:LTS
ruby-doorkeeper-openid-connect

Package

Name
ruby-doorkeeper-openid-connect
Purl
pkg:deb/ubuntu/ruby-doorkeeper-openid-connect?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.8.7-1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "ruby-doorkeeper-openid-connect",
            "binary_version":  "1.8.7-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44476.json"
Ubuntu:26.04:LTS
ruby-doorkeeper-openid-connect

Package

Name
ruby-doorkeeper-openid-connect
Purl
pkg:deb/ubuntu/ruby-doorkeeper-openid-connect?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.8.7-1
1.8.11-1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "ruby-doorkeeper-openid-connect",
            "binary_version":  "1.8.11-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44476.json"