What is CVE-2026-18089?

CVE-2026-18089 is a high-severity vulnerability in Timlegge Net::saml2, classified under Improper Certificate Validation. CVSS score: 7.5/10. Published 2026-08-03.

How severe is CVE-2026-18089?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Timlegge Net::saml2

CVE-2026-18089

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. verify_xml in Net::SAML2::Role::VerifyXML runs "r…

Vulnerability class: Improper Certificate Validation

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Timlegge Net::saml2 — versions 0

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation
CWE-347 — Improper Verification of Cryptographic Signature

References

9b29abf9-4ab0-4765-b253-1875cd9b441e (release-notes)
9b29abf9-4ab0-4765-b253-1875cd9b441e
9b29abf9-4ab0-4765-b253-1875cd9b441e
9b29abf9-4ab0-4765-b253-1875cd9b441e

Frequently asked questions

What is CVE-2026-18089?: CVE-2026-18089 is a high-severity vulnerability in Timlegge Net::saml2, classified under Improper Certificate Validation. CVSS score: 7.5/10. Published 2026-08-03.
How severe is CVE-2026-18089?: High severity. CVSS v3 base score is 7.5 out of 10.