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- Snyk ID SNYK-JS-JWTSIMPLE-174523
- published 25 Apr 2019
- disclosed 24 Apr 2019
- credit Daniel Gunawan
How to fix?
jwt-simple to version 0.5.3 or higher.
jwt-simple is a JWT(JSON Web Token) encode and decode module.
Affected versions of this package are vulnerable to Signature Verification Bypass. If no algorithm is specified in the
decode() function, the packages uses the algorithm in the JWT to decode tokens. This allows an attacker to create a HS256 (symmetric algorithm) JWT with the server's public key as secret, and the package will verify it as HS256 instead of RS256 (asymmetric algorithm).