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CRYPTO-027High severity-15 points

JWT signature verification disabled

Part of Security, which counts for 30% of the overall score. When this check fires it deducts 15 points from that category, once per scan, no matter how many places it turns up.

What it detects

Decoding a JWT with verify_signature=false / verify=False trusts unverified claims, which is equivalent to accepting a forged token.

Why it matters

Decoding a JWT with signature verification turned off (verify_signature=false / verify=False) means the server reads the claims without checking they came from a trusted issuer. An attacker can hand-craft a token with any claims they like. It is equivalent to accepting a forged token.

How to fix it

Always verify the signature: call the verifying decode with the correct key and an explicit algorithms allowlist. If you only need to read a claim before verification (for example to pick a key by kid), read the header without trusting the payload, then verify fully before using any claim. Never make an authorization decision on an unverified token.

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