{"id":"CVE-2026-86304","state":"PUBLISHED","title":"MojoX::Authentication versions before 0.006 for Perl allow SAML authentication bypass because parse_assertion builds Net::SAML2::Binding::POST without a trust anchor","description":"MojoX::Authentication versions before 0.006 for Perl allow SAML authentication bypass because parse_assertion builds Net::SAML2::Binding::POST without a trust anchor.\n\nparse_assertion in MojoX::Authentication::Model::SAML2 calls Net::SAML2::Binding::POST->new with no cacert, cert_text or anchors argument, then passes the returned XML to Net::SAML2::Protocol::Assertion->new_from_xml with the IdP signing certificate as cacert. In Net::SAML2 before 0.86 that certificate guards only encrypted assertions, so the signature on an unencrypted assertion is checked against the certificate the response itself carries.\n\nAn attacker starts a SAML login, then posts a response signed with a certificate of their own. The audience, InResponseTo and timestamp checks that follow are all satisfiable by the attacker, so the response authenticates any NameID it carries.","publishedAt":"2026-09-06T22:24:19.368Z","updatedAt":"2026-09-08T18:41:46.209Z","severity":{"score":9.8,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"CISA-ADP"},"assigner":"CPANSec","products":["MojoX-Authentication"],"affected":[{"packageName":"MojoX-Authentication","packageURL":"pkg:cpan/MojoX-Authentication","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"0.006","versionType":"custom"}],"collectionURL":"https://cpan.org/modules","modules":["MojoX::Authentication"],"programFiles":["lib/MojoX/Authentication/Model/SAML2.pm"],"programRoutines":[{"name":"MojoX::Authentication::Model::SAML2::parse_assertion"}]}],"references":["https://metacpan.org/release/POLETTIX/MojoX-Authentication-0.006/source/Changes","https://metacpan.org/release/POLETTIX/MojoX-Authentication-0.004/source/lib/MojoX/Authentication/Model/SAML2.pm#L188","https://www.cve.org/CVERecord?id=CVE-2026-18089"],"weaknesses":["CWE-347"],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/86xxx/CVE-2026-86304.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-86304","state":"PUBLISHED","datePublished":"2026-09-06T22:24:19.368Z","dateUpdated":"2026-09-08T18:41:46.209Z","assignerShortName":"CPANSec","assignerOrgId":"9b29abf9-4ab0-4765-b253-1875cd9b441e","dateReserved":"2026-09-06T17:59:12.036Z"},"containers":{"cna":{"title":"MojoX::Authentication versions before 0.006 for Perl allow SAML authentication bypass because parse_assertion builds Net::SAML2::Binding::POST without a trust anchor","descriptions":[{"lang":"en","value":"MojoX::Authentication versions before 0.006 for Perl allow SAML authentication bypass because parse_assertion builds Net::SAML2::Binding::POST without a trust anchor.\n\nparse_assertion in MojoX::Authentication::Model::SAML2 calls Net::SAML2::Binding::POST->new with no cacert, cert_text or anchors argument, then passes the returned XML to Net::SAML2::Protocol::Assertion->new_from_xml with the IdP signing certificate as cacert. In Net::SAML2 before 0.86 that certificate guards only encrypted assertions, so the signature on an unencrypted assertion is checked against the certificate the response itself carries.\n\nAn attacker starts a SAML login, then posts a response signed with a certificate of their own. The audience, InResponseTo and timestamp checks that follow are all satisfiable by the attacker, so the response authenticates any NameID it carries."}],"affected":[{"packageName":"MojoX-Authentication","packageURL":"pkg:cpan/MojoX-Authentication","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"0.006","versionType":"custom"}],"collectionURL":"https://cpan.org/modules","modules":["MojoX::Authentication"],"programFiles":["lib/MojoX/Authentication/Model/SAML2.pm"],"programRoutines":[{"name":"MojoX::Authentication::Model::SAML2::parse_assertion"}]}],"references":[{"url":"https://metacpan.org/release/POLETTIX/MojoX-Authentication-0.006/source/Changes","tags":["release-notes"]},{"url":"https://metacpan.org/release/POLETTIX/MojoX-Authentication-0.004/source/lib/MojoX/Authentication/Model/SAML2.pm#L188"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-18089","tags":["related"]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-347","description":"CWE-347 Improper Verification of Cryptographic Signature","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"CPANSec","orgId":"9b29abf9-4ab0-4765-b253-1875cd9b441e","dateUpdated":"2026-09-06T22:24:19.368Z"},"impacts":[{"capecId":"CAPEC-115","descriptions":[{"lang":"en","value":"CAPEC-115 Authentication Bypass"}]}],"solutions":[{"lang":"en","value":"Upgrade to MojoX-Authentication 0.006 or later."}],"source":{"discovery":"UNKNOWN"},"timeline":[{"lang":"en","time":"2026-07-31T00:00:00.000Z","value":"Version 0.006 released with fix."}],"workarounds":[{"lang":"en","value":"For deployments that cannot upgrade, install Net::SAML2 0.86 or later. SAML login then fails rather than accepting a forged assertion."}],"x_generator":{"engine":"cpansec-cna-tool 0.1"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":9.8,"attackVector":"NETWORK","baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","integrityImpact":"HIGH","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"NONE","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-09-08T18:41:21.191743Z","id":"CVE-2026-86304","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-08T18:41:46.209Z"}}]}}}