CVE-2026-92289

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{"affected": [{"affectedData": [{"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"}]}], "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"}], "cveTags": [], "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."}], "id": "CVE-2026-92289", "lastModified": "2026-09-26T23:16:38.897", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 9.1, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.2, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-92289", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-09-25T15:38:54.575555Z", "version": "2.0.3"}}]}, "published": "2026-09-25T01:16:48.943", "references": [{"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "url": "https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/releases/v2.23.4"}, {"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "url": "https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/work_items/3719"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.openwall.com/lists/oss-security/2026/09/25/2"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/work_items/3719"}], "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-1390"}], "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.23.0,2.23.4)"}}], "enrichment": {"confidence": 80.0, "confidence_source": "inferred", "scores": [{"score": 80.0, "source": "inferred"}]}, "product": "portal", "vendor": "lemonldap-ng"}], "created": "2026-09-25T09:00:14.769705+00:00", "updated": "2026-09-28T19:42:57.868099+00:00", "vendors": ["lemonldap-ng", "lemonldap-ng$PRODUCT$portal"]}