API Hacking: Versioning and Deprecated Endpoints

Product ships v2; marketing still hits v1; mobile builds pin ancient paths. Deprecated endpoints are where authorization patches often never landed.

Inventory habits

• Diff OpenAPI/Swagger generations across environments

• Compare mobile app strings to live routes

• Retest fixes on every advertised version, not just the newest

Reporting tip

Call out “fix applied to v2 only” as residual risk. Recommend decommission plans with monitoring for legacy clients.

---

Worth reading next

• API Hacking: Swagger and OpenAPI Recon

• Bug Bounty: How to Write a Vulnerability Report