CVE-2026-92289

{"id": "CVE-2026-92289", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-92289", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-09-25T15:38:54.575555Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "cvssData": {"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"}, "impactScore": 5.2, "exploitabilityScore": 3.9}]}, "affected": [{"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "affectedData": [{"repo": "https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng", "modules": ["Lemonldap::NG::Portal"], "versions": [{"status": "affected", "version": "2.23.0", "lessThan": "2.23.4", "versionType": "custom"}], "packageURL": "pkg:cpan/Lemonldap-NG-Portal", "packageName": "Lemonldap-NG-Portal", "programFiles": ["lib/Lemonldap/NG/Portal/Lib/OpenIDConnect.pm", "lib/Lemonldap/NG/Portal/Issuer/OpenIDConnect.pm"], "collectionURL": "https://cpan.org/modules", "defaultStatus": "unaffected", "programRoutines": [{"name": "Lemonldap::NG::Portal::Lib::OpenIDConnect::checkEndPointAuthenticationCredentials"}, {"name": "Lemonldap::NG::Portal::Issuer::OpenIDConnect::token"}]}]}], "published": "2026-09-25T01:16:48.943", "references": [{"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": "9b29abf9-4ab0-4765-b253-1875cd9b441e"}, {"url": "http://www.openwall.com/lists/oss-security/2026/09/25/2", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/work_items/3719", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "description": [{"lang": "en", "value": "CWE-1390"}]}], "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."}], "lastModified": "2026-09-26T23:16:38.897", "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e"}