{"id":"CVE-2026-86304","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.\n\nparse_assertion in MojoX::Authentication::Model::SAML2 calls Net::SAM…","summary":"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::SAM…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-347"],"product":"MojoX-Authentication","affected":["MojoX-Authentication < 0.006"],"published":"2026-09-06","updated":"2026-09-08","sourceUpdated":"2026-09-08T19:20:13.933","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-86304","references":[{"url":"https://metacpan.org/release/POLETTIX/MojoX-Authentication-0.004/source/lib/MojoX/Authentication/Model/SAML2.pm#L188","label":"9b29abf9-4ab0-4765-b253-1875cd9b441e"},{"url":"https://metacpan.org/release/POLETTIX/MojoX-Authentication-0.006/source/Changes","label":"9b29abf9-4ab0-4765-b253-1875cd9b441e"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-18089","label":"9b29abf9-4ab0-4765-b253-1875cd9b441e"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-09-08T18:41:21.191743Z"},"epss":0.00225,"epssPercentile":0.13495,"ingestedAt":"2026-09-07T12:10:14.671Z","slug":"CVE-2026-86304","body":"## Overview\n\nMojoX::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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":8344,"id":"CVE-2026-86304","ts":1788919998451,"field":"cvss","old":null,"new":"9.8"},{"seq":8343,"id":"CVE-2026-86304","ts":1788919998451,"field":"severity","old":"none","new":"critical"},{"seq":8153,"id":"CVE-2026-86304","ts":1788919290276,"field":"cvss","old":"9.8","new":null},{"seq":8152,"id":"CVE-2026-86304","ts":1788919290276,"field":"severity","old":"critical","new":"none"},{"seq":7962,"id":"CVE-2026-86304","ts":1788916360582,"field":"cvss","old":null,"new":"9.8"},{"seq":7961,"id":"CVE-2026-86304","ts":1788916360582,"field":"severity","old":"none","new":"critical"},{"seq":7771,"id":"CVE-2026-86304","ts":1788915307988,"field":"cvss","old":"9.8","new":null},{"seq":7770,"id":"CVE-2026-86304","ts":1788915307988,"field":"severity","old":"critical","new":"none"},{"seq":7580,"id":"CVE-2026-86304","ts":1788912721970,"field":"cvss","old":null,"new":"9.8"},{"seq":7579,"id":"CVE-2026-86304","ts":1788912721970,"field":"severity","old":"none","new":"critical"},{"seq":7389,"id":"CVE-2026-86304","ts":1788911340243,"field":"cvss","old":"9.8","new":null},{"seq":7388,"id":"CVE-2026-86304","ts":1788911340243,"field":"severity","old":"critical","new":"none"},{"seq":7193,"id":"CVE-2026-86304","ts":1788909080861,"field":"cvss","old":null,"new":"9.8"},{"seq":7192,"id":"CVE-2026-86304","ts":1788909080861,"field":"severity","old":"none","new":"critical"},{"seq":7005,"id":"CVE-2026-86304","ts":1788907396632,"field":"cvss","old":"9.8","new":null},{"seq":7004,"id":"CVE-2026-86304","ts":1788907396632,"field":"severity","old":"critical","new":"none"},{"seq":6807,"id":"CVE-2026-86304","ts":1788905446671,"field":"cvss","old":null,"new":"9.8"},{"seq":6806,"id":"CVE-2026-86304","ts":1788905446671,"field":"severity","old":"none","new":"critical"},{"seq":6625,"id":"CVE-2026-86304","ts":1788903463587,"field":"cvss","old":"9.8","new":null},{"seq":6624,"id":"CVE-2026-86304","ts":1788903463587,"field":"severity","old":"critical","new":"none"},{"seq":6411,"id":"CVE-2026-86304","ts":1788901812660,"field":"cvss","old":null,"new":"9.8"},{"seq":6410,"id":"CVE-2026-86304","ts":1788901812660,"field":"severity","old":"none","new":"critical"},{"seq":6241,"id":"CVE-2026-86304","ts":1788899563124,"field":"cvss","old":"9.8","new":null},{"seq":6240,"id":"CVE-2026-86304","ts":1788899563124,"field":"severity","old":"critical","new":"none"},{"seq":6003,"id":"CVE-2026-86304","ts":1788898181452,"field":"cvss","old":null,"new":"9.8"},{"seq":6002,"id":"CVE-2026-86304","ts":1788898181452,"field":"severity","old":"none","new":"critical"},{"seq":5892,"id":"CVE-2026-86304","ts":1788895712046,"field":"cvss","old":"9.8","new":null},{"seq":5891,"id":"CVE-2026-86304","ts":1788895712046,"field":"severity","old":"critical","new":"none"},{"seq":5752,"id":"CVE-2026-86304","ts":1788894572853,"field":"cvss","old":null,"new":"9.8"},{"seq":5751,"id":"CVE-2026-86304","ts":1788894572853,"field":"severity","old":"none","new":"critical"}]}