UBUNTU-CVE-2026-19349

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Source
https://ubuntu.com/security/CVE-2026-19349
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-19349.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-19349
Upstream
Published
2026-08-16T14:16:00Z
Modified
2026-08-19T13:31:42Z
Severity
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Lemonldap::NG::Portal versions from 2.0.0 before 2.16.9, from 2.17.0 before 2.21.5, from 2.22.0 before 2.23.3 for Perl allow authentication bypass via an OAuth2 state parameter stored as an SSO session in the GitHub and LinkedIn backends. Before redirecting to the identity provider, extractFormInfo() creates the state session with the positional call getApacheSession( undef, 1, 0, 'GitHubState' ). getApacheSession() takes a session id followed by a named argument hash, so the trailing arguments become that hash, kind defaults to SSO, and the state is written to the global session storage as a regular SSO session. Its identifier is handed to the unauthenticated visitor as the state parameter of the redirection URL. Any visitor who reaches the GitHub or LinkedIn endpoint can replay that identifier as a session cookie and obtain a valid SSO session without authenticating. The session holds neither _user nor authenticationLevel, which the shipped bootstrap configuration accepts because it grants virtual hosts a "default => accept" access rule; deployments whose rules test the user or require an authentication level are less exposed. Only configurations with the GitHub or LinkedIn authentication module enabled are affected.

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-2026-19349.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-2026-19349.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-2026-19349.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-2026-19349.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-2026-19349.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-2026-19349.json"