{"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"}}]}}

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{}