GMS-2015-8: Forgeable Public/Private Tokens
Since algorithm
isn’t enforced in jwt.decode()
, a malicious user could choose what algorithm is sent sent to the server. If the server is expecting RSA but is sent HMAC-SHA with RSA’s public key, the server will think the public key is actually an HMAC private key. This could be used to forge any data an attacker wants.
References
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