Lemonldap::NG::Portal versions from 2.20.0 before 2.21.6, from 2.22.0 before 2.23.4 for Perl allow unauthenticated OAuth2 token introspection because checkEndPointAuthenticationCredentials does not ve
Lemonldap::NG::Portal versions from 2.20.0 before 2.21.6, from 2.22.0 before 2.23.4 for Perl allow unauthenticated OAuth2 token introspection because checkEndPointAuthenticationCredentials does not verify the client secret of a public Relying Party. checkEndPointAuthenticationCredentials() skips the secret comparison for a Relying Party marked public and still returns the authentication method deduced from the request, client_secret_basic or client_secret_post. introspection() rejects a caller only when that method is missing or none, so a request carrying a public client_id and an arbitrary or empty secret passes the endpoint's authentication check. An attacker who holds an access token and knows the client_id of any public Relying Party can confirm the token is active and read its metadata, including scope, audience, expiry and the sub claim. The sub claim is computed with the calling Relying Party's user identifier attribute, so an attacker can translate a user identifier from one Relying Party to another, defeating per-client and pseudonymous identifiers.
CVE-2026-92288
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-92288
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng",
"modules": [
"Lemonldap::NG::Portal"
],
"versions": [
{
"status": "affected",
"version": "2.20.0",
"lessThan": "2.21.6",
"versionType": "custom"
},
{
"status": "affected",
"version": "2.22.0",
"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::introspection"
}
]
}
]- Related CVEs
- CVE-2026-92288
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #2132 · Revision 1
- Added to Heist Feed
- Publisher date