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Vulnerability details: VCID-x3qp-nkgs-8bh9
Vulnerability ID VCID-x3qp-nkgs-8bh9
Aliases GMS-2015-4
Summary JWT Verification bypass with "none" algorithm It is possible for an attacker to create his own signed token with any payload he wants and have it considered valid using the "none" algorithm.
Status Published
Exploitability 0.5
Weighted Severity 0.0
Risk None
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
There are no known severity scores.
Reference id Reference type URL
https://auth0.com/blog/2015/03/31/critical-vulnerabilities-in-json-web-token-libraries/
https://github.com/auth0/node-jsonwebtoken/commit/1bb584bc382295eeb7ee8c4452a673a77a68b687
https://www.timmclean.net/2015/02/25/jwt-alg-none.html
No exploits are available.
There are no known vectors.

No EPSS data available for this vulnerability.

Date Actor Action Source VulnerableCode Version
2026-06-12T15:39:13.561059+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/npm/jsonwebtoken/GMS-2015-4.yml 38.6.0