What is CVE-2026-89043?

CVE-2026-89043 is a high-severity vulnerability in Krakenjs Passport-Saml-Encrypted, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.4/10. Published 2026-09-10.

How severe is CVE-2026-89043?

High severity. CVSS v3 base score is 7.4 out of 10.

Vulnerability in Krakenjs Passport-Saml-Encrypted

CVE-2026-89043

passport-saml-encrypted through 0.1.13 contains an XML signature wrapping vulnerability where signature verification and assertion extraction use independent XPath lookups with no cross-validation. Attackers holding any validly signed SAML message can prepend a forged unsigned assertion that gets accepted as the verified identity while the genuine signature validates against the original assertion.

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

Krakenjs Passport-saml-encrypted

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-2026-89043?: CVE-2026-89043 is a high-severity vulnerability in Krakenjs Passport-Saml-Encrypted, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.4/10. Published 2026-09-10.
How severe is CVE-2026-89043?: High severity. CVSS v3 base score is 7.4 out of 10.