DevHacker Noonabout 3 hours ago
3 Ways JWTs Get Forged, and the One Rule That Stops Them All
6 min read
Three JWT forgery attacks exploit trusting the token's header: alg:none, weak HMAC secrets, and RS-to-HS algorithm confusion. The single defensive habit is pinning allowed algorithms server-side with an explicit allowlist, which blocks all three attacks at once.
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