High severityJavaAuthentication & SecretsHIGH confidence
JWT Signature Not Verified
The JWT is parsed/decoded without verifying its signature (parseClaimsJwt / JWT.decode read an unsigned or unchecked token, CWE-347).
Standards mapping
- OWASP Top 10
- A02:2021 - Cryptographic Failures
- OWASP ASVS
- V3.5.3 (L1)
Vulnerable vs. safe
Flagged by this check
parser.parseClaimsJwt(token);Passes - the safe pattern
parser.parseClaimsJws(token);Why it matters & how to fix it
The JWT is parsed/decoded without verifying its signature (parseClaimsJwt / JWT.decode read an unsigned or unchecked token, CWE-347). An attacker can forge arbitrary claims. Verify signed tokens: with jjwt use parseClaimsJws(token) after setSigningKey(...); with java-jwt build a JWTVerifier from the algorithm and call verify(token).
References
Rule ID integsec-java-jwt-signature-not-verified - engine: Opengrep - license: MIT - Copyright (c) IntegSec Inc.
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