Vulnerability · Published Sep 10, 2026 · Assigned by VulnCheck

CVE-2026-89043passport-saml-encrypted through 0.1.13 XML Signature Wrapping via Assertion Prepending

High 7.4

In plain English

A high-severity security flaw in passport-saml-encrypted from krakenjs. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities).

Severity (CVSS 3.1)7.4High

Exploit odds (30 days)0.3%top 76.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
krakenjs	passport-saml-encrypted	0 – through 0.1.13

Weakness: CWE-347 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

References

Reporter advisory: XML signature wrapping issue-tracking
Signature located by an unconstrained XPath at v0.1.13 technical-description
Assertion selected by a separate first-match XPath at v0.1.13 technical-description
krakenjs/passport-saml-encrypted product
VulnCheck Advisory: passport-saml-encrypted through 0.1.13 XML Signature Wrapping via Assertion Prepending third-party-advisory