JWT Security Testing Services
Packages & Pricing.

JWT security testing for login sessions and tokens

JWT security testing checks whether someone could forge, steal or replay the tokens that keep your users signed in. Omeiro audits JWT implementation, refresh token storage and session termination, and looks for CSRF weaknesses along the way.

A weak token handling flaw can let an attacker become any user. The test shows whether yours holds.

JWT security testing: signing, expiry and revocation

JWT security testing looks at how tokens are created, signed, validated and revoked. We check algorithm handling, key management, expiry settings, audience and issuer validation and what happens at logout or password change. Send token samples from a test account, a description of your authentication flow and the libraries in use. Library versions matter, because several well-known attacks came from libraries that accepted unexpected algorithms or unsigned tokens.

Sessions fail in ordinary ways: tokens that stay valid for days, refresh tokens that never rotate, logout that only clears the browser, or admin claims the client can alter. Our JWT security testing reports each issue with a proof and a fix, such as short lifetimes, refresh rotation and server-side checks. Teams often extend the review to the wider web application with a full penetration test.