JWT Secret Check — Can Anyone Forge Your Session Tokens?
DevMeth checks the 48 known AI-code failure patterns — not a penetration test or a security guarantee.
What the issue is
A hardcoded or fallback JWT secret means anyone who has seen your code can mint valid session tokens for any user — including admin.
Why AI tools generate it
AI scaffolds add `process.env.JWT_SECRET || "dev-secret"` so the app boots without configuration — which makes every session forgeable whenever the env var is missing.
How DevMeth detects it
A code scan flags jwt sign/verify calls whose secret is a string literal, and JWT secrets with `||`/`??` hardcoded fallbacks. Env-only reads are not flagged.
JWT signing secrets are hardcoded or fall back to a weak default
WHAT WE FOUND
C47 — masked sample
The fix, in three steps
Generate a 48-byte random secret, move it to your environment, delete every literal and fallback, and rotate — old tokens are forgeable.
Run a free scan and each finding carries a paste-ready fix prompt you can act on.
Try a free scanFAQ
The fallback only fires when the env var is missing — why does that matter?
Because deployments drift: a preview environment, a fresh server, a renamed secret — the app boots happily on the fallback and signs sessions anyone can forge. Silent weak-default behavior is the vulnerability.
Isn't a long random literal in code fine?
It's a committed credential — the repo (and every fork, backup, and ex-employee) holds a key that mints admin tokens. Secrets belong to the environment, not the source. The scan reports this class separately as a committed-secret finding.
What's the fix?
`openssl rand -base64 48` into your environment, fail fast when unset, delete every fallback, and sign everyone out once — previously issued tokens are forgeable.
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.