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Application Security

When the Cache Key Leaks One User's Page to Another

A personalised response cached under a key that does not include the thing that made it personal. One of the few bugs that discloses one customer's data to another with no attacker involved, and it arrives as a confused support ticket.

Sep 18, 20266 min read
Application Security

The Migration Is the Riskiest Part of the Pull Request

It runs in production with the highest privileges in your system, usually unattended, and gets reviewed as an implementation detail at the bottom of the diff. It can drop a constraint that was the only thing enforcing a security property.

Sep 18, 20266 min read
Application Security

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.

Sep 18, 20265 min read
Application Security

The Export Button Is the Shortest Path From Account to Your Data on a Laptop

Every other endpoint is paginated. Export deliberately is not. It ships as a feature request, reuses the read permission, and is almost never reviewed as a data egress channel.

Sep 18, 20266 min read
Application Security

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.

Sep 18, 20265 min read
Application Security

You Cannot Patch a Mobile App Quickly, So Build the Kill Switch First

Server-side remediation is a deployment. Mobile remediation is a distribution problem with a tail you do not control, and a share of your install base will still be running the vulnerable version next year.

Sep 18, 20266 min read
Application Security

Your Tag Manager Is a Second Deployment Pipeline With No Engineer In It

Engineering has code review, CI and branch protection. Marketing can execute arbitrary JavaScript on every page including checkout, by clicking publish. Nobody designed it that way.

Sep 18, 20266 min read
Application Security

Your API Inventory Is Smaller Than Your API

The spec says one number, the gateway serves a larger one, and the difference is your unprotected surface: undecommissioned v1 routes, framework-generated handlers, and the debug endpoint added during an incident.

Sep 18, 20266 min read
Application Security

The Notebook Nobody Reviewed Is Running on a Schedule

It pulls customer records, holds a password in cell four, installs packages at runtime, and has run nightly for eighteen months. The format hides both the state and the data, and nothing gated the moment it became infrastructure.

Sep 17, 20266 min read

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