https://db.gcve.eu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Mon, 28 Sep 2026 14:10:01 +0000 https://db.gcve.eu/vuln/cve-2026-92289 <p><strong>Affected:</strong> Lemonldap-NG-Portal</p> <p>Lemonldap::NG::Portal versions from 2.23.0 before 2.23.4 for Perl allow a PKCE bypass for public Relying Parties in &#34;PKCE or secret&#34; mode because checkEndPointAuthenticationCredentials does not verify the client secret.</p> <p>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.</p> <p>An attacker who intercepts an authorization code issued to a public Relying Party can exchange it for the user&#39;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.</p> <p><strong>Affected:</strong> Lemonldap-NG-Portal</p> <p>Lemonldap::NG::Portal versions from 2.23.0 before 2.23.4 for Perl allow a PKCE bypass for public Relying Parties in &#34;PKCE or secret&#34; mode because checkEndPointAuthenticationCredentials does not verify the client secret.</p> <p>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.</p> <p>An attacker who intercepts an authorization code issued to a public Relying Party can exchange it for the user&#39;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.</p> https://db.gcve.eu/vuln/cve-2026-92289