CVE-2026-89042: Signature Bypass (CVSS 9.1)

Description

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.

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CVSS v3.1 Score

9.1

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS — Exploit Prediction

0.0027

Probability of exploitation

0.19%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-347 CWE-347

References

Other References

https://github.com/krakenjs/passport-saml-encrypted https://github.com/krakenjs/passport-saml-encrypted/blob/v0.1.13/lib/saml.js#L296 https://github.com/krakenjs/passport-saml-encrypted/blob/v0.1.13/lib/saml.js#L321 https://github.com/krakenjs/passport-saml-encrypted/issues/29 https://www.vulncheck.com/advisories/passport-saml-encrypted-through-0.1.13-authentication-bypass-via-missing-signature-verification

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2026-89042? +

CVE-2026-89042 has a CVSS v3.1 score of 9.1 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0027, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-89042? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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