Beyond Authentication: Why API Authorization Failures Drive Most Security Breaches

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Most API security breaches stem not from failed authentication but from flawed authorization, where verified users can access data belonging to others simply by altering a URL parameter. The most prevalent flaw, known as broken object-level authorization, occurs when an endpoint fetches a record by ID without confirming that the requesting user actually owns it. Experts recommend enforcing ownership checks directly within database queries rather than relying on application-layer logic that can be overlooked in future code changes. Other common vulnerabilities include over-returning sensitive data in API responses, mass assignment attacks, and unrestricted resource consumption that can enable both denial-of-service and billing abuse. The OWASP API Security Top 10 remains the standard reference for teams looking to systematically address these risks across their APIs.

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ProgrammingDEV Community ·

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