CVE-2026-18089
HIGH
CVSS 7.5
CVE-2026-18089 HIGH
Qu'est-ce que c'est ?
Net::SAML2 versions before 0.86 for Perl allow SAML authentication bypass by verifying responses against the response-embedded certificate in verify_xml when no trust anchor is configured. verify_xml in Net::SAML2::Role::VerifyXML runs "return if !$anchors && !$cacert;" as soon as the XML::Sig check succeeds, and that check uses the X.509 certificate taken from the response's own dsig:KeyInfo/dsig:X509Certificate element, so an unanchored response is checked only against the key it carries. Binding::POST declares cacert as an optional Maybe[Str] with no default, so a POST binding built without one takes that path, and _verify_encrypted_assertion returns early the same way with "return $xml unless $cacert;". Any caller that constructs Binding::POST or calls Assertion->new_from_xml without a cacert, cert_text, or anchors argument accepts a response signed by an attacker generated key whose self-signed certificate is embedded in that response, authenticating an arbitrary assertion.
Technologies affectées
Non précisé par la fiche NVD.
Recommandation
Vérifie la disponibilité d'un correctif pour la technologie concernée et applique-le dès que possible. Consulte la fiche NVD pour les références officielles du fournisseur.
Exploits publics connus (0)
Aucun proof-of-concept public trouvé sur GitHub à ce jour. Ça peut changer : les PoC sont souvent publiés plusieurs jours ou semaines après la divulgation.