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FKIE_CVE-2026-86304

Vulnerability from fkie_nvd - Published: 2026-09-06 23:17 - Updated: 2026-09-06 23:17
Severity
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. parse_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. An 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.
References
9b29abf9-4ab0-4765-b253-1875cd9b441ehttps://metacpan.org/release/POLETTIX/MojoX-Authentication-0.004/source/lib/MojoX/Authentication/Model/SAML2.pm#L188
9b29abf9-4ab0-4765-b253-1875cd9b441ehttps://metacpan.org/release/POLETTIX/MojoX-Authentication-0.006/source/Changes
9b29abf9-4ab0-4765-b253-1875cd9b441ehttps://www.cve.org/CVERecord?id=CVE-2026-18089
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "modules": [
            "MojoX::Authentication"
          ],
          "packageName": "MojoX-Authentication",
          "packageURL": "pkg:cpan/MojoX-Authentication",
          "programFiles": [
            "lib/MojoX/Authentication/Model/SAML2.pm"
          ],
          "programRoutines": [
            {
              "name": "MojoX::Authentication::Model::SAML2::parse_assertion"
            }
          ],
          "versions": [
            {
              "lessThan": "0.006",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    }
  ],
  "cveTags": [],
  "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-\u003enew with no cacert, cert_text or anchors argument, then passes the returned XML to Net::SAML2::Protocol::Assertion-\u003enew_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."
    }
  ],
  "id": "CVE-2026-86304",
  "lastModified": "2026-09-06T23:17:39.483",
  "metrics": {},
  "published": "2026-09-06T23:17:39.483",
  "references": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "url": "https://metacpan.org/release/POLETTIX/MojoX-Authentication-0.004/source/lib/MojoX/Authentication/Model/SAML2.pm#L188"
    },
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "url": "https://metacpan.org/release/POLETTIX/MojoX-Authentication-0.006/source/Changes"
    },
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-18089"
    }
  ],
  "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-347"
        }
      ],
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "type": "Secondary"
    }
  ]
}



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