CVE Explorer
CVE-2026-18108
Net::SAML2 versions before 0.86 for Perl allow authentication bypass because _verify_encrypted_assertion accepts an EncryptedAssertion whose decrypted content carries no signature.
_verify_encrypted_assertion decrypts the EncryptedAssertion and returns it as verified when it carries no signature, via "return $xml unless $xpath->exists('dsig:Signature', $assert);". The signature check and the trust anchor check that follow run only when a signature is present, so a decrypted assertion with no ds
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"collectionURL":"https://cpan.org/modules","defaultStatus":"unaffected","packageName":"Net-SAML2","product":"Net::SAML2","programFiles":["lib/Net/SAML2/Protocol/Assertion.pm"],"programRoutines":[{"name":"Net::SAML2::Protocol::Assertion::_verify_encrypted_assertion"},{"name":"Net::SAML2::Protocol::Assertion::new_from_xml"}],"repo":"https://github.com/perl-net-saml2/perl-Net-SAML2","vendor":"TIMLEGGE","versions":[{"lessThan":"0.86","status":"affected","version":"0","versionType":"custom"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:9c9b8da5b3177fa304cb01161aeb5637f6312dc07e960f2f9bb5d900021d5db1 · sha256:471dc5241d950941… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.8,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:9c9b8da5b3177fa304cb01161aeb5637f6312dc07e960f2f9bb5d900021d5db1 · sha256:471dc5241d950941… · /containers/adp/0/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-347","description":"CWE-347 Improper Verification of Cryptographic Signature","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:9c9b8da5b3177fa304cb01161aeb5637f6312dc07e960f2f9bb5d900021d5db1 · sha256:471dc5241d950941… · /containers/cna/problemTypes/0/descriptions/0
Source references
3 source assertions{"tags":["patch"],"url":"https://github.com/perl-net-saml2/perl-Net-SAML2/commit/d916468586404518b8cf3c78dbd001cc1f1046a7.patch"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:9c9b8da5b3177fa304cb01161aeb5637f6312dc07e960f2f9bb5d900021d5db1 · sha256:471dc5241d950941… · /containers/cna/references/0
{"url":"https://metacpan.org/release/TIMLEGGE/Net-SAML2-0.85/source/lib/Net/SAML2/Protocol/Assertion.pm#L78"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:9c9b8da5b3177fa304cb01161aeb5637f6312dc07e960f2f9bb5d900021d5db1 · sha256:471dc5241d950941… · /containers/cna/references/2
{"tags":["release-notes"],"url":"https://metacpan.org/release/TIMLEGGE/Net-SAML2-0.86/changes"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:9c9b8da5b3177fa304cb01161aeb5637f6312dc07e960f2f9bb5d900021d5db1 · sha256:471dc5241d950941… · /containers/cna/references/1
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.