$ cat writeup.md…
$ cat writeup.md…
hackadvisor
Task: expense management platform migrated from v1 (numeric IDs) to v2 (UUID-based) API, with deprecated v1 endpoints still partially active. Solution: discover API versioning via X-API-Version header, enumerate /api/v1/expenses/{id} with sequential numeric IDs to access another user's confidential expenses containing the flag.
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