JWT Misuse Check — Can Your Session Tokens Be Forged or Stolen?
DevMeth checks the 48 known AI-code failure patterns — not a penetration test or a security guarantee.
What the issue is
A JWT setup that verifies without pinning the algorithm, or that puts the signing secret in client-reachable code, lets an attacker forge tokens or steal sessions.
Why AI tools generate it
AI tools wire up JWT auth quickly, often leaving the default (algorithm-confusion-prone) verify or dropping the secret somewhere browser-visible.
How DevMeth detects it
A code scan looks for JWT verify() calls without a pinned algorithms allowlist and for JWT secrets in client-reachable code.
Your JWT setup can be forged or stolen from the browser
WHAT WE FOUND
verify(token, secret) — no pinned algorithms allowlist
The fix, in three steps
Pin the allowed algorithms on every verify() call and move any JWT secret to a server-only environment variable. Three steps.
Run a free scan and each finding carries a paste-ready fix prompt you can act on.
Try a free scanFAQ
What is JWT algorithm confusion?
Verifying a token without pinning the algorithms lets an attacker present a token signed with a different (none or HMAC) algorithm that the verifier wrongly accepts.
Where should the JWT secret live?
Only in server-side environment variables — never in client-reachable code, where it can be read and used to forge tokens.
What's the fix?
Pin the allowed algorithms on every verify() call and keep the signing secret server-only.
DevMeth checks the 48 known AI-code failure patterns — not a penetration test or a security guarantee. A clear result means each known pattern was checked and found clear or not applicable for your app; it is not a guarantee of security.