CVE-2026-92289 (GCVE-0-2026-92289)
Vulnerability from cvelistv5
Published
2026-09-25 00:15
Modified
2026-09-26 22:29
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-1390 - Weak Authentication
Summary
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.
With 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.
An 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.
References
| URL | Tags | |
|---|---|---|
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2026-09-25T02:10:01.838Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"url": "http://www.openwall.com/lists/oss-security/2026/09/25/2"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"cvssV3_1": {
"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"
}
},
{
"other": {
"content": {
"id": "CVE-2026-92289",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-09-25T15:38:54.575555Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-09-26T22:29:08.052Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"exploit"
],
"url": "https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/work_items/3719"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"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\u0027s 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": {
"dateUpdated": "2026-09-25T00:15:49.826Z",
"orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
"shortName": "CPANSec"
},
"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"
}
}
},
"cveMetadata": {
"assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
"assignerShortName": "CPANSec",
"cveId": "CVE-2026-92289",
"datePublished": "2026-09-25T00:15:49.826Z",
"dateReserved": "2026-09-15T23:43:48.309Z",
"dateUpdated": "2026-09-26T22:29:08.052Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"vulnrichment": {
"containers": "{\"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\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"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\": {\"id\": \"CVE-2026-92289\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-09-25T15:38:54.575555Z\"}}}], \"references\": [{\"url\": \"https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/work_items/3719\", \"tags\": [\"exploit\"]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-09-25T15:41:09.467Z\"}}], \"cna\": {\"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\", \"source\": {\"discovery\": \"UNKNOWN\"}, \"affected\": [{\"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\"}]}], \"solutions\": [{\"lang\": \"en\", \"value\": \"Upgrade to Lemonldap-NG-Portal 2.23.4 or later.\"}], \"references\": [{\"url\": \"https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/work_items/3719\", \"tags\": [\"issue-tracking\"]}, {\"url\": \"https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/releases/v2.23.4\", \"tags\": [\"release-notes\"]}], \"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\"}, \"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\u0027s 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\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-1390\", \"description\": \"CWE-1390 Weak Authentication\"}]}], \"providerMetadata\": {\"orgId\": \"9b29abf9-4ab0-4765-b253-1875cd9b441e\", \"shortName\": \"CPANSec\", \"dateUpdated\": \"2026-09-25T00:15:49.826Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-92289\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-26T22:29:08.052Z\", \"dateReserved\": \"2026-09-15T23:43:48.309Z\", \"assignerOrgId\": \"9b29abf9-4ab0-4765-b253-1875cd9b441e\", \"datePublished\": \"2026-09-25T00:15:49.826Z\", \"assignerShortName\": \"CPANSec\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
Loading…
Loading…