Critical
lemonldap-ng — security advisory
Lemonldap::NG::Portal versions from 2.23.0 before 2.23.4 for Perl allow a PKCE bypass for public Relying Parties in "PKCE or secret" mode because checkEndPointAuthenticationCredentials does not verify the client secret. With oidcRPMetaDataOptionsRequirePKCE set to 2, the authorization endpoint issues a code even when the request carries no code_challenge, and token() admits the exchange as long as a challenge was stored or an authentication method was returned for the caller. checkEndPointAuthenticationCredentials() skips the secret comparison for a Relying Party marked public and still returns the method deduced from the request, so any Basic or form credential satisfies the secret branch. validatePKCEChallenge() then passes, because neither a challenge nor a verifier is present. An attacker who intercepts an authorization code issued to a public Relying Party can exchange it for the user's access, ID and refresh tokens by replaying the client_id with an arbitrary secret, which is the attack PKCE prevents. Dynamic client registration creates every Relying Party in this mode.
- Products
- lemonldap-ng
- Affected versions
- 1.3.3-1, 1.4.6-1, 1.4.6-2, 1.4.6-3, 1.9.10-1, 1.9.13-2, 1.9.14-1, 1.9.15-1, 1.9.16-2, 2.0.11+ds-4, 2.0.13+ds-3, 2.0.13+ds-3ubuntu1, 2.0.5+ds-2, 2.0.6+ds-2, 2.0.7+ds-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, 2.21.0+ds-3, 2.22.0+ds-2, 2.22.1+ds-1, 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
- Fixed versions
- Not specified
- CVEs
- CVE-2026-92289
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:32 UTC · Revision 1
Source evidence
Lemonldap::NG::Portal versions from 2.23.0 before 2.23.4 for Perl allow a PKCE bypass for public Relying Parties in "PKCE or secret" mode because checkEndPointAuthenticationCredentials does not verify the client secret. With oidcRPMetaDataOptionsRequirePKCE set to 2, the authorization endpoint issues a code even when the request carries no code_challenge, and token() admits the exchange as long as a challenge was stored or an authentication method was returned for the caller. checkEndPointAuthenticationCredentials() skips the secret comparison for a Relying Party marked public and still returns the method deduced from the request, so any Basic or form credential satisfies the secret branch. validatePKCEChallenge() then passes, because neither a challenge nor a verifier is present. An attacker who intercepts an authorization code issued to a public Relying Party can exchange it for the user's access, ID and refresh tokens by replaying the client_id with an arbitrary secret, which is the attack PKCE prevents. Dynamic client registration creates every Relying Party in this mode.
osv:UBUNTU-CVE-2026-92289
lemonldap-ng
Fixed versions: Not specified
lemonldap-ng
Fixed versions: Not specified
lemonldap-ng
Fixed versions: Not specified
lemonldap-ng
Fixed versions: Not specified
lemonldap-ng
Fixed versions: Not specified
lemonldap-ng
Fixed versions: Not specified
lemonldap-ng
Fixed versions: Not specified
Complete source record
{
"id": "08ccca15916ca4f50ab60d0c5e1227f092c3d8cae828e0561076fe33721dba3f",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-92289",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-92289",
"summary": "Lemonldap::NG::Portal versions from 2.23.0 before 2.23.4 for Perl allow a PKCE bypass for public Relying Parties in \"PKCE or secret\" mode because checkEndPointAuthenticationCredentials does not verify the client secret. With oidcRPMetaDataOptionsRequirePKCE set to 2, the authorization endpoint issues a code even when the request carries no code_challenge, and token() admits the exchange as long as a challenge was stored or an authentication method was returned for the caller. checkEndPointAuthenticationCredentials() skips the secret comparison for a Relying Party marked public and still returns the method deduced from the request, so any Basic or form credential satisfies the secret branch. validatePKCEChallenge() then passes, because neither a challenge nor a verifier is present. An attacker who intercepts an authorization code issued to a public Relying Party can exchange it for the user's access, ID and refresh tokens by replaying the client_id with an arbitrary secret, which is the attack PKCE prevents. Dynamic client registration creates every Relying Party in this mode.",
"evidence": "osv:UBUNTU-CVE-2026-92289",
"products": [
{
"name": {
"value": "lemonldap-ng",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.3.3-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.4.6-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.4.6-2",
"evidence": "/affected/0/versions"
},
{
"value": "1.4.6-3",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "lemonldap-ng",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.9.10-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.9.13-2",
"evidence": "/affected/1/versions"
},
{
"value": "1.9.14-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.9.15-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.9.16-2",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "lemonldap-ng",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.0.5+ds-2",
"evidence": "/affected/2/versions"
},
{
"value": "2.0.6+ds-2",
"evidence": "/affected/2/versions"
},
{
"value": "2.0.7+ds-2",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "lemonldap-ng",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.0.11+ds-4",
"evidence": "/affected/3/versions"
},
{
"value": "2.0.13+ds-3",
"evidence": "/affected/3/versions"
},
{
"value": "2.0.13+ds-3ubuntu1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "lemonldap-ng",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.16.2+ds-1",
"evidence": "/affected/4/versions"
},
{
"value": "2.17.1+ds-1",
"evidence": "/affected/4/versions"
},
{
"value": "2.17.2+ds-1",
"evidence": "/affected/4/versions"
},
{
"value": "2.17.2+ds-2",
"evidence": "/affected/4/versions"
},
{
"value": "2.18.1+ds-1",
"evidence": "/affected/4/versions"
},
{
"value": "2.18.2+ds-1",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "lemonldap-ng",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.22.2+ds-1",
"evidence": "/affected/5/versions"
},
{
"value": "2.22.3+ds-1",
"evidence": "/affected/5/versions"
},
{
"value": "2.23.0+ds-3",
"evidence": "/affected/5/versions"
},
{
"value": "2.23.0+ds-4",
"evidence": "/affected/5/versions"
},
{
"value": "2.23.2+ds-1",
"evidence": "/affected/5/versions"
},
{
"value": "2.23.2+ds-2",
"evidence": "/affected/5/versions"
},
{
"value": "2.23.3+ds-1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "lemonldap-ng",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.21.0+ds-3",
"evidence": "/affected/6/versions"
},
{
"value": "2.22.0+ds-2",
"evidence": "/affected/6/versions"
},
{
"value": "2.22.1+ds-1",
"evidence": "/affected/6/versions"
},
{
"value": "2.22.2+ds-1",
"evidence": "/affected/6/versions"
}
]
}
],
"severity": "critical",
"structured": {
"id": "UBUNTU-CVE-2026-92289",
"aliases": [
"UBUNTU-CVE-2026-92289"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "lemonldap-ng",
"purl": "pkg:deb/ubuntu/lemonldap-ng?arch=source&distro=xenial",
"ecosystem": "Ubuntu:16.04:LTS"
},
"versions": [
"1.3.3-1",
"1.4.6-1",
"1.4.6-2",
"1.4.6-3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-92289.json"
},
"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"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "lemonldap-ng",
"purl": "pkg:deb/ubuntu/lemonldap-ng?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
"1.9.10-1",
"1.9.13-2",
"1.9.14-1",
"1.9.15-1",
"1.9.16-2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-92289.json"
},
"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"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "lemonldap-ng",
"purl": "pkg:deb/ubuntu/lemonldap-ng?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
"2.0.5+ds-2",
"2.0.6+ds-2",
"2.0.7+ds-2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-92289.json"
},
"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"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "lemonldap-ng",
"purl": "pkg:deb/ubuntu/lemonldap-ng?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"2.0.11+ds-4",
"2.0.13+ds-3",
"2.0.13+ds-3ubuntu1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-92289.json"
},
"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"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "lemonldap-ng",
"purl": "pkg:deb/ubuntu/lemonldap-ng?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"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"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-92289.json"
},
"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"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "lemonldap-ng",
"purl": "pkg:deb/ubuntu/lemonldap-ng?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"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"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-92289.json"
},
"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"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "lemonldap-ng",
"purl": "pkg:deb/ubuntu/lemonldap-ng?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"2.21.0+ds-3",
"2.22.0+ds-2",
"2.22.1+ds-1",
"2.22.2+ds-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-92289.json"
},
"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"
}
]
}
}
],
"modified": "2026-10-17T13:01:17.593956731Z",
"provider": "osv",
"upstream": [
"CVE-2026-92289"
],
"references": [
"https://ubuntu.com/security/CVE-2026-92289",
"https://www.cve.org/CVERecord?id=CVE-2026-92289",
"https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/work_items/3719"
]
},
"related_cves": [
{
"value": "CVE-2026-92289",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 361523,
"published_at": "2026-09-25T01:16:00+00:00"
}