Developer finds missing ownership checks exposed user resumes in AI analyzer app

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A developer building smart-resume-analyzer, an AI-powered resume and interview coaching tool, discovered a silent security vulnerability while performing routine performance cleanup. Several server actions in the Next.js app fetched resume analyses by record ID without verifying that the requesting user actually owned that record. Because server actions are network endpoints under the hood, anyone with a valid analysis ID could retrieve another user's resume data, ATS scores, and extracted personal details by calling the endpoint directly. The frontend never exposed arbitrary ID inputs, so the flaw was invisible during normal use and passed all existing tests. The developer confirmed the issue by manually querying a test account's data while unauthenticated, then patched the gap by adding user-ownership checks to all affected server actions.

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