What is CVE-2026-89042?

CVE-2026-89042 is a critical-severity vulnerability, classified under Improper Verification of Cryptographic Signature. CVSS score: 9.1/10. Published 2026-09-10.

How severe is CVE-2026-89042?

Critical severity. CVSS v3 base score is 9.1 out of 10.

CVE-2026-89042

CVE-2026-89042

passport-saml-encrypted through 0.1.13 makes SAML signature verification conditional on an optional cert option, allowing attackers to bypass authentication by submitting unsigned SAML responses. Attackers can post forged SAML responses with arbitrary NameID and attributes to the assertion consumer service endpoint to receive authenticated profiles without valid signatures.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

References

disclosure@vulncheck.com (issue-tracking)
disclosure@vulncheck.com (technical-description)
disclosure@vulncheck.com (technical-description)
disclosure@vulncheck.com (product)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-89042?: CVE-2026-89042 is a critical-severity vulnerability, classified under Improper Verification of Cryptographic Signature. CVSS score: 9.1/10. Published 2026-09-10.
How severe is CVE-2026-89042?: Critical severity. CVSS v3 base score is 9.1 out of 10.