{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-92289",
        "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
        "state": "PUBLISHED",
        "assignerShortName": "CPANSec",
        "dateReserved": "2026-09-15T23:43:48.309Z",
        "datePublished": "2026-09-25T00:15:49.826Z",
        "dateUpdated": "2026-09-26T22:29:08.052Z"
    },
    "containers": {
        "cna": {
            "affected": [
                {
                    "collectionURL": "https://cpan.org/modules",
                    "defaultStatus": "unaffected",
                    "modules": [
                        "Lemonldap::NG::Portal"
                    ],
                    "packageName": "Lemonldap-NG-Portal",
                    "packageURL": "pkg:cpan/Lemonldap-NG-Portal",
                    "programFiles": [
                        "lib/Lemonldap/NG/Portal/Lib/OpenIDConnect.pm",
                        "lib/Lemonldap/NG/Portal/Issuer/OpenIDConnect.pm"
                    ],
                    "programRoutines": [
                        {
                            "name": "Lemonldap::NG::Portal::Lib::OpenIDConnect::checkEndPointAuthenticationCredentials"
                        },
                        {
                            "name": "Lemonldap::NG::Portal::Issuer::OpenIDConnect::token"
                        }
                    ],
                    "repo": "https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng",
                    "versions": [
                        {
                            "lessThan": "2.23.4",
                            "status": "affected",
                            "version": "2.23.0",
                            "versionType": "custom"
                        }
                    ]
                }
            ],
            "descriptions": [
                {
                    "lang": "en",
                    "value": "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.\n\nWith 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.\n\nAn 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."
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-1390",
                            "description": "CWE-1390 Weak Authentication",
                            "lang": "en",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
                "shortName": "CPANSec",
                "dateUpdated": "2026-09-25T00:15:49.826Z"
            },
            "references": [
                {
                    "tags": [
                        "issue-tracking"
                    ],
                    "url": "https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/work_items/3719"
                },
                {
                    "tags": [
                        "release-notes"
                    ],
                    "url": "https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/releases/v2.23.4"
                }
            ],
            "solutions": [
                {
                    "lang": "en",
                    "value": "Upgrade to Lemonldap-NG-Portal 2.23.4 or later."
                }
            ],
            "source": {
                "discovery": "UNKNOWN"
            },
            "title": "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",
            "workarounds": [
                {
                    "lang": "en",
                    "value": "For deployments that cannot upgrade to 2.23.4, set RequirePKCE to 1 on public Relying Parties so that a code challenge is always required. Relying Parties created through dynamic registration are always in \"PKCE or secret\" mode, so that endpoint has to be disabled as well."
                }
            ],
            "x_generator": {
                "engine": "cpansec-cna-tool 0.1"
            }
        },
        "adp": [
            {
                "title": "CVE Program Container",
                "references": [
                    {
                        "url": "http://www.openwall.com/lists/oss-security/2026/09/25/2"
                    }
                ],
                "providerMetadata": {
                    "orgId": "af854a3a-2127-422b-91ae-364da2661108",
                    "shortName": "CVE",
                    "dateUpdated": "2026-09-25T02:10:01.838Z"
                }
            },
            {
                "references": [
                    {
                        "url": "https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/work_items/3719",
                        "tags": [
                            "exploit"
                        ]
                    }
                ],
                "metrics": [
                    {
                        "cvssV3_1": {
                            "scope": "UNCHANGED",
                            "version": "3.1",
                            "baseScore": 9.1,
                            "attackVector": "NETWORK",
                            "baseSeverity": "CRITICAL",
                            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
                            "integrityImpact": "HIGH",
                            "userInteraction": "NONE",
                            "attackComplexity": "LOW",
                            "availabilityImpact": "NONE",
                            "privilegesRequired": "NONE",
                            "confidentialityImpact": "HIGH"
                        }
                    },
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-09-25T15:38:54.575555Z",
                                "id": "CVE-2026-92289",
                                "options": [
                                    {
                                        "Exploitation": "poc"
                                    },
                                    {
                                        "Automatable": "yes"
                                    },
                                    {
                                        "Technical Impact": "total"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-09-26T22:29:08.052Z"
                }
            }
        ]
    }
}