ASVS 5.0 V9.2.1: Enforce Token Validity Windows (nbf and exp)
ASVS V9.2.1 (Level 1): if a token has a validity period, only accept it inside that window. Check exp and nbf, set small clock skew, and test with expired tokens.
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ASVS V9.2.1 (Level 1): if a token has a validity period, only accept it inside that window. Check exp and nbf, set small clock skew, and test with expired tokens.
ASVS V9.1.3 (Level 1): signing keys come from pre-configured trusted sources. Ignore jku, x5u and jwk headers unless they match an allowlist.
ASVS V9.1.2 (Level 1): only allowlisted algorithms may create or verify tokens, with no None algorithm. Stop alg confusion with fixed settings and tests.
ASVS V9.1.1 (Level 1) says self-contained tokens such as JWTs must have their signature or MAC verified before any claim is used. Code and tests.
ASVS V8.4.2 (Level 3): admin interfaces need several layers, including continuous identity checks and device posture, not just a network location.
ASVS V8.4.1 (Level 2) requires controls so one tenant's operations can never affect another tenant. Row scoping, tests and the mistakes that cause leaks.
ASVS V8.3.3 (Level 3): downstream services should decide access using the original caller's permissions, not an intermediary's service account.
ASVS V8.3.2 (Level 3): when a user's rights change, the change must take effect now. If tokens delay it, add alerting and rollback. Patterns and tests.
ASVS V8.3.1 (Level 1) says authorization must be enforced in a trusted service layer, never in client-side JavaScript. How to do it and how to prove it.
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