{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-18089",
        "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
        "state": "PUBLISHED",
        "assignerShortName": "CPANSec",
        "dateReserved": "2026-07-28T16:26:10.967Z",
        "datePublished": "2026-08-03T12:42:08.879Z",
        "dateUpdated": "2026-08-03T19:56:33.033Z"
    },
    "containers": {
        "cna": {
            "affected": [
                {
                    "collectionURL": "https://cpan.org/modules",
                    "defaultStatus": "unaffected",
                    "packageName": "Net-SAML2",
                    "product": "Net::SAML2",
                    "programFiles": [
                        "lib/Net/SAML2/Role/VerifyXML.pm",
                        "lib/Net/SAML2/Binding/POST.pm",
                        "lib/Net/SAML2/Protocol/Assertion.pm"
                    ],
                    "programRoutines": [
                        {
                            "name": "Net::SAML2::Role::VerifyXML::verify_xml"
                        },
                        {
                            "name": "Net::SAML2::Binding::POST::handle_response"
                        },
                        {
                            "name": "Net::SAML2::Protocol::Assertion::_verify_encrypted_assertion"
                        }
                    ],
                    "repo": "https://github.com/perl-net-saml2/perl-Net-SAML2",
                    "vendor": "TIMLEGGE",
                    "versions": [
                        {
                            "lessThan": "0.86",
                            "status": "affected",
                            "version": "0",
                            "versionType": "custom"
                        }
                    ]
                }
            ],
            "descriptions": [
                {
                    "lang": "en",
                    "value": "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.\n\nverify_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;\".\n\nAny 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."
                }
            ],
            "impacts": [
                {
                    "capecId": "CAPEC-115",
                    "descriptions": [
                        {
                            "lang": "en",
                            "value": "CAPEC-115 Authentication Bypass"
                        }
                    ]
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-347",
                            "description": "CWE-347 Improper Verification of Cryptographic Signature",
                            "lang": "en",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-295",
                            "description": "CWE-295 Improper Certificate Validation",
                            "lang": "en",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
                "shortName": "CPANSec",
                "dateUpdated": "2026-08-03T12:42:08.879Z"
            },
            "references": [
                {
                    "tags": [
                        "release-notes"
                    ],
                    "url": "https://metacpan.org/release/TIMLEGGE/Net-SAML2-0.88/source/Changes"
                },
                {
                    "url": "https://metacpan.org/release/TIMLEGGE/Net-SAML2-0.85/source/lib/Net/SAML2/Role/VerifyXML.pm#L32"
                },
                {
                    "url": "https://metacpan.org/release/TIMLEGGE/Net-SAML2-0.85/source/lib/Net/SAML2/Binding/POST.pm#L21"
                },
                {
                    "url": "https://metacpan.org/release/TIMLEGGE/Net-SAML2-0.85/source/lib/Net/SAML2/Protocol/Assertion.pm#L84"
                }
            ],
            "solutions": [
                {
                    "lang": "en",
                    "value": "Upgrade to Net::SAML2 0.86 or later, which requires a cacert or cert_text trust anchor before a response or assertion signature is verified."
                }
            ],
            "source": {
                "discovery": "UNKNOWN"
            },
            "timeline": [
                {
                    "lang": "en",
                    "time": "2026-07-31T00:00:00.000Z",
                    "value": "Version 0.86 released with fix."
                },
                {
                    "lang": "en",
                    "time": "2026-07-31T00:00:00.000Z",
                    "value": "Version 0.88 released, re-issuing 0.86 with a corrected version number."
                }
            ],
            "title": "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",
            "workarounds": [
                {
                    "lang": "en",
                    "value": "For deployments that cannot upgrade, construct Net::SAML2::Binding::POST, and call Net::SAML2::Protocol::Assertion->new_from_xml, with a cacert, cert_text, or anchors argument identifying the IdP signing certificate."
                }
            ],
            "x_generator": {
                "engine": "cpansec-cna-tool 0.1"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "cvssV3_1": {
                            "scope": "UNCHANGED",
                            "version": "3.1",
                            "baseScore": 7.5,
                            "attackVector": "NETWORK",
                            "baseSeverity": "HIGH",
                            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
                            "integrityImpact": "HIGH",
                            "userInteraction": "NONE",
                            "attackComplexity": "LOW",
                            "availabilityImpact": "NONE",
                            "privilegesRequired": "NONE",
                            "confidentialityImpact": "NONE"
                        }
                    },
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-08-03T19:56:09.872860Z",
                                "id": "CVE-2026-18089",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "yes"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-08-03T19:56:33.033Z"
                }
            }
        ]
    }
}