idempotency
Safeguard articles tagged "idempotency" — guides, analysis, and best practices for software supply chain and application security.
4 articles
An Idempotency Key That Only Checks Prior Receipt Protects Nothing
A client retries a timed-out payment request. Both copies arrive close together, both pass the check for whether the key exists, because neither has finished processing yet, and both charge the card.
Nobody Notices When a Scheduled Job Stops Running
They run at three in the morning with broad credentials, unattended, and failure produces nothing because the output was always invisible. A retention job that silently stops means you are keeping data you promised to delete.
Five Ways a Webhook Receiver Goes Wrong
It is a public, unauthenticated endpoint that performs privileged actions on a JSON body from the internet. Everyone knows this, and most implementations still get one of five things wrong in ways that pass every test.
Your Queue Consumer Is an Endpoint Nobody Reviewed
Your API validates every request and authenticates every caller. Behind it a worker reads messages and acts on them with none of those checks, because internal is trusted. That worker takes untrusted input and performs privileged actions.
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