UBUNTU-CVE-2026-92288

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Source
https://ubuntu.com/security/CVE-2026-92288
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-92288.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-92288
Upstream
Published
2026-09-25T01:16:00Z
Modified
2026-10-17T13:00:37Z
Severity
  • 9.1 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Lemonldap::NG::Portal versions from 2.20.0 before 2.21.6, from 2.22.0 before 2.23.4 for Perl allow unauthenticated OAuth2 token introspection because checkEndPointAuthenticationCredentials does not verify the client secret of a public Relying Party. checkEndPointAuthenticationCredentials() skips the secret comparison for a Relying Party marked public and still returns the authentication method deduced from the request, client_secret_basic or client_secret_post. introspection() rejects a caller only when that method is missing or none, so a request carrying a public client_id and an arbitrary or empty secret passes the endpoint's authentication check. An attacker who holds an access token and knows the client_id of any public Relying Party can confirm the token is active and read its metadata, including scope, audience, expiry and the sub claim. The sub claim is computed with the calling Relying Party's user identifier attribute, so an attacker can translate a user identifier from one Relying Party to another, defeating per-client and pseudonymous identifiers.

References

Affected packages

Ubuntu:16.04:LTS
lemonldap-ng

Package

Name
lemonldap-ng
Purl
pkg:deb/ubuntu/lemonldap-ng?arch=source&distro=xenial

Affected ranges

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

Affected versions

1.*
1.3.3-1
1.4.6-1
1.4.6-2
1.4.6-3

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "lemonldap-ng",
            "binary_version":  "1.4.6-3"
        },
        {
            "binary_name":  "liblemonldap-ng-common-perl",
            "binary_version":  "1.4.6-3"
        },
        {
            "binary_name":  "liblemonldap-ng-conf-perl",
            "binary_version":  "1.4.6-3"
        },
        {
            "binary_name":  "liblemonldap-ng-handler-perl",
            "binary_version":  "1.4.6-3"
        },
        {
            "binary_name":  "liblemonldap-ng-manager-perl",
            "binary_version":  "1.4.6-3"
        },
        {
            "binary_name":  "liblemonldap-ng-portal-perl",
            "binary_version":  "1.4.6-3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-92288.json"
Ubuntu:18.04:LTS
lemonldap-ng

Package

Name
lemonldap-ng
Purl
pkg:deb/ubuntu/lemonldap-ng?arch=source&distro=bionic

Affected ranges

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

Affected versions

1.*
1.9.10-1
1.9.13-2
1.9.14-1
1.9.15-1
1.9.16-2

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "lemonldap-ng",
            "binary_version":  "1.9.16-2"
        },
        {
            "binary_name":  "lemonldap-ng-fastcgi-server",
            "binary_version":  "1.9.16-2"
        },
        {
            "binary_name":  "lemonldap-ng-handler",
            "binary_version":  "1.9.16-2"
        },
        {
            "binary_name":  "liblemonldap-ng-common-perl",
            "binary_version":  "1.9.16-2"
        },
        {
            "binary_name":  "liblemonldap-ng-handler-perl",
            "binary_version":  "1.9.16-2"
        },
        {
            "binary_name":  "liblemonldap-ng-manager-perl",
            "binary_version":  "1.9.16-2"
        },
        {
            "binary_name":  "liblemonldap-ng-portal-perl",
            "binary_version":  "1.9.16-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-92288.json"
Ubuntu:20.04:LTS
lemonldap-ng

Package

Name
lemonldap-ng
Purl
pkg:deb/ubuntu/lemonldap-ng?arch=source&distro=focal

Affected ranges

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

Affected versions

2.*
2.0.5+ds-2
2.0.6+ds-2
2.0.7+ds-2

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "lemonldap-ng",
            "binary_version":  "2.0.7+ds-2"
        },
        {
            "binary_name":  "lemonldap-ng-fastcgi-server",
            "binary_version":  "2.0.7+ds-2"
        },
        {
            "binary_name":  "lemonldap-ng-handler",
            "binary_version":  "2.0.7+ds-2"
        },
        {
            "binary_name":  "lemonldap-ng-uwsgi-app",
            "binary_version":  "2.0.7+ds-2"
        },
        {
            "binary_name":  "liblemonldap-ng-common-perl",
            "binary_version":  "2.0.7+ds-2"
        },
        {
            "binary_name":  "liblemonldap-ng-handler-perl",
            "binary_version":  "2.0.7+ds-2"
        },
        {
            "binary_name":  "liblemonldap-ng-manager-perl",
            "binary_version":  "2.0.7+ds-2"
        },
        {
            "binary_name":  "liblemonldap-ng-portal-perl",
            "binary_version":  "2.0.7+ds-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-92288.json"
Ubuntu:22.04:LTS
lemonldap-ng

Package

Name
lemonldap-ng
Purl
pkg:deb/ubuntu/lemonldap-ng?arch=source&distro=jammy

Affected ranges

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

Affected versions

2.*
2.0.11+ds-4
2.0.13+ds-3
2.0.13+ds-3ubuntu1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "lemonldap-ng",
            "binary_version":  "2.0.13+ds-3ubuntu1"
        },
        {
            "binary_name":  "lemonldap-ng-fastcgi-server",
            "binary_version":  "2.0.13+ds-3ubuntu1"
        },
        {
            "binary_name":  "lemonldap-ng-handler",
            "binary_version":  "2.0.13+ds-3ubuntu1"
        },
        {
            "binary_name":  "lemonldap-ng-uwsgi-app",
            "binary_version":  "2.0.13+ds-3ubuntu1"
        },
        {
            "binary_name":  "liblemonldap-ng-common-perl",
            "binary_version":  "2.0.13+ds-3ubuntu1"
        },
        {
            "binary_name":  "liblemonldap-ng-handler-perl",
            "binary_version":  "2.0.13+ds-3ubuntu1"
        },
        {
            "binary_name":  "liblemonldap-ng-manager-perl",
            "binary_version":  "2.0.13+ds-3ubuntu1"
        },
        {
            "binary_name":  "liblemonldap-ng-portal-perl",
            "binary_version":  "2.0.13+ds-3ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-92288.json"
Ubuntu:24.04:LTS
lemonldap-ng

Package

Name
lemonldap-ng
Purl
pkg:deb/ubuntu/lemonldap-ng?arch=source&distro=noble

Affected ranges

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

Affected versions

2.*
2.16.2+ds-1
2.17.1+ds-1
2.17.2+ds-1
2.17.2+ds-2
2.18.1+ds-1
2.18.2+ds-1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "lemonldap-ng",
            "binary_version":  "2.18.2+ds-1"
        },
        {
            "binary_name":  "lemonldap-ng-fastcgi-server",
            "binary_version":  "2.18.2+ds-1"
        },
        {
            "binary_name":  "lemonldap-ng-handler",
            "binary_version":  "2.18.2+ds-1"
        },
        {
            "binary_name":  "lemonldap-ng-uwsgi-app",
            "binary_version":  "2.18.2+ds-1"
        },
        {
            "binary_name":  "liblemonldap-ng-common-perl",
            "binary_version":  "2.18.2+ds-1"
        },
        {
            "binary_name":  "liblemonldap-ng-handler-perl",
            "binary_version":  "2.18.2+ds-1"
        },
        {
            "binary_name":  "liblemonldap-ng-manager-perl",
            "binary_version":  "2.18.2+ds-1"
        },
        {
            "binary_name":  "liblemonldap-ng-portal-perl",
            "binary_version":  "2.18.2+ds-1"
        },
        {
            "binary_name":  "liblemonldap-ng-ssoaas-apache-client-perl",
            "binary_version":  "2.18.2+ds-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-92288.json"
Ubuntu:26.04:LTS
lemonldap-ng

Package

Name
lemonldap-ng
Purl
pkg:deb/ubuntu/lemonldap-ng?arch=source&distro=resolute

Affected ranges

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

Affected versions

2.*
2.21.0+ds-3
2.22.0+ds-2
2.22.1+ds-1
2.22.2+ds-1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "lemonldap-ng",
            "binary_version":  "2.22.2+ds-1"
        },
        {
            "binary_name":  "lemonldap-ng-fastcgi-server",
            "binary_version":  "2.22.2+ds-1"
        },
        {
            "binary_name":  "lemonldap-ng-handler",
            "binary_version":  "2.22.2+ds-1"
        },
        {
            "binary_name":  "lemonldap-ng-uwsgi-app",
            "binary_version":  "2.22.2+ds-1"
        },
        {
            "binary_name":  "liblemonldap-ng-common-perl",
            "binary_version":  "2.22.2+ds-1"
        },
        {
            "binary_name":  "liblemonldap-ng-handler-perl",
            "binary_version":  "2.22.2+ds-1"
        },
        {
            "binary_name":  "liblemonldap-ng-manager-perl",
            "binary_version":  "2.22.2+ds-1"
        },
        {
            "binary_name":  "liblemonldap-ng-portal-perl",
            "binary_version":  "2.22.2+ds-1"
        },
        {
            "binary_name":  "liblemonldap-ng-ssoaas-apache-client-perl",
            "binary_version":  "2.22.2+ds-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-92288.json"
Ubuntu:26.10
lemonldap-ng

Package

Name
lemonldap-ng
Purl
pkg:deb/ubuntu/lemonldap-ng?arch=source&distro=stonking

Affected ranges

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

Affected versions

2.*
2.22.2+ds-1
2.22.3+ds-1
2.23.0+ds-3
2.23.0+ds-4
2.23.2+ds-1
2.23.2+ds-2
2.23.3+ds-1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "lemonldap-ng",
            "binary_version":  "2.23.3+ds-1"
        },
        {
            "binary_name":  "lemonldap-ng-fastcgi-server",
            "binary_version":  "2.23.3+ds-1"
        },
        {
            "binary_name":  "lemonldap-ng-handler",
            "binary_version":  "2.23.3+ds-1"
        },
        {
            "binary_name":  "lemonldap-ng-uwsgi-app",
            "binary_version":  "2.23.3+ds-1"
        },
        {
            "binary_name":  "liblemonldap-ng-common-perl",
            "binary_version":  "2.23.3+ds-1"
        },
        {
            "binary_name":  "liblemonldap-ng-handler-perl",
            "binary_version":  "2.23.3+ds-1"
        },
        {
            "binary_name":  "liblemonldap-ng-manager-perl",
            "binary_version":  "2.23.3+ds-1"
        },
        {
            "binary_name":  "liblemonldap-ng-portal-perl",
            "binary_version":  "2.23.3+ds-1"
        },
        {
            "binary_name":  "liblemonldap-ng-ssoaas-apache-client-perl",
            "binary_version":  "2.23.3+ds-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-92288.json"