{
   "document": {
      "aggregate_severity": {
         "text": "critical"
      },
      "category": "csaf_security_advisory",
      "csaf_version": "2.0",
      "distribution": {
         "tlp": {
            "label": "WHITE",
            "url": "https://www.first.org/tlp/"
         }
      },
      "lang": "en",
      "notes": [
         {
            "category": "description",
            "text": "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.",
            "title": "Vulnerability Description"
         }
      ],
      "publisher": {
         "category": "other",
         "contact_details": "gdt@cpan.org",
         "name": "giterlizzi",
         "namespace": "https://github.com/giterlizzi/"
      },
      "references": [
         {
            "category": "self",
            "summary": "CPANSA-Lemonldap-NG-Portal-2026-92289 JSON",
            "url": "https://raw.githubusercontent.com/giterlizzi/perl-CPANSA-CSAF/develop/csaf/white/2026/cpansa-lemonldap-ng-portal-2026-92289.json"
         },
         {
            "category": "external",
            "summary": "https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/releases/v2.23.4",
            "url": "https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/releases/v2.23.4"
         },
         {
            "category": "external",
            "summary": "https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/work_items/3719",
            "url": "https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/work_items/3719"
         },
         {
            "category": "external",
            "summary": "http://www.openwall.com/lists/oss-security/2026/09/25/2",
            "url": "http://www.openwall.com/lists/oss-security/2026/09/25/2"
         },
         {
            "category": "external",
            "summary": "https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/work_items/3719",
            "url": "https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/work_items/3719"
         },
         {
            "category": "external",
            "summary": "CVE-2026-92289 (NVD)",
            "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-92289"
         }
      ],
      "title": "Lemonldap-NG-Portal vulnerability",
      "tracking": {
         "current_release_date": "2026-09-25T00:00:00",
         "generator": {
            "engine": {
               "name": "CSAF Perl Toolkit",
               "version": "0.26"
            }
         },
         "id": "CPANSA-Lemonldap-NG-Portal-2026-92289",
         "initial_release_date": "2026-09-25T00:00:00",
         "revision_history": [
            {
               "date": "2026-09-25T00:00:00",
               "number": "1",
               "summary": "First release"
            }
         ],
         "status": "final",
         "version": "1"
      }
   },
   "product_tree": {
      "branches": [
         {
            "branches": [
               {
                  "category": "product_version_range",
                  "name": "vers:cpan/>=2.23.0|<2.23.4",
                  "product": {
                     "name": "Lemonldap-NG-Portal greater than or equal 2.23.0 and less than 2.23.4",
                     "product_id": "CSAFPID-0001",
                     "product_identification_helper": {
                        "purl": "pkg:cpan/Lemonldap-NG-Portal"
                     }
                  }
               },
               {
                  "category": "product_version_range",
                  "name": "vers:cpan/>=2.23.4",
                  "product": {
                     "name": "Lemonldap-NG-Portal greater than or equal 2.23.4",
                     "product_id": "CSAFPID-0002",
                     "product_identification_helper": {
                        "purl": "pkg:cpan/Lemonldap-NG-Portal"
                     }
                  }
               }
            ],
            "category": "product_name",
            "name": "Lemonldap-NG-Portal"
         }
      ]
   },
   "vulnerabilities": [
      {
         "cve": "CVE-2026-92289",
         "cwe": {
            "id": "CWE-1390",
            "name": "Weak Authentication"
         },
         "notes": [
            {
               "category": "description",
               "text": "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.",
               "title": "Vulnerability Description"
            }
         ],
         "product_status": {
            "fixed": [
               "CSAFPID-0002"
            ],
            "known_affected": [
               "CSAFPID-0001"
            ]
         },
         "scores": [
            {
               "cvss_v3": {
                  "baseScore": 9.1,
                  "baseSeverity": "CRITICAL",
                  "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
                  "version": "3.1"
               },
               "products": [
                  "CSAFPID-0001"
               ]
            }
         ]
      }
   ]
}