Key API Security Threats Developers Must Address in 2025 and Beyond

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APIs have become the primary attack surface in modern software stacks, handling traffic from mobile apps, microservices, and AI agents alike. The Verizon 2025 Data Breach Investigations Report identifies web application and API attacks among the top causes of confirmed breaches. Broken Object Level Authorization (BOLA), ranked first in OWASP's API Security Top 10, remains the most common real-world flaw, occurring when endpoints verify identity but fail to confirm resource ownership. APIs that interface with large language models introduce additional risks, including prompt injection and insecure output handling, requiring strict input and output validation. Security experts recommend zero-trust architecture, per-agent scoped credentials, mutual TLS between services, and automated authorization testing to reduce exposure.

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