API security focuses on protecting application interfaces from unauthorized access, data exposure, abuse, and flaws in authentication or design.
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Background for this topic.
Application Programming Interfaces (APIs) are sets of rules that allow software applications to communicate and exchange data, often enabling functionality across different systems or services. APIs define how requests and responses are structured, making it possible for programs to interact without direct user involvement. In cybersecurity, APIs are commonly exposed over networks as endpoints that handle sensitive operations like data retrieval, user authentication, or transaction processing.
APIs increase the attack surface by exposing endpoints that attackers can target with unauthorized access attempts, injection attacks, or denial-of-service. Common risks include weak or missing authentication, insufficient input validation, and improper rate limiting. Effective API security requires strong authentication protocols (e.g., OAuth), strict input validation to prevent injection, rate limiting to mitigate abuse, and comprehensive logging to detect anomalies. Protecting APIs is critical to prevent data leaks, privilege escalation, and service disruption in interconnected environments.
Anthropic says it has revoked OpenAI's access to the Claude API after ChatGPT's engineers were found using Claude's coding tools. [...]
Series C Funding Supports Evolution to Protecting API-Powered Business RevenueWith AI now outpacing cloud in enterprise adoption, Wallarm is evolving its API security platform to safeguard not just endpoints, but the business logic that drives digital revenue. With $55 million in new funding, the company is targeting CIOs and expanding globally to meet demand across sectors.
Using the API Connections for Azure Logic Apps, a security researcher found unauthenticated users could access sensitive data of other customers.
Banks Must Secure APIs, Vet Partners and Prepare for Open Finance Threats in 2025Open finance is revolutionizing banking, but it's also expanding the attack surface. Discover the critical API, data privacy and third-party risks facing financial institutions in 2025 - and how to build a secure future.
Exposed API documentation is a gift-wrapped roadmap for threat actors. The free Autoswagger tool from Intruder scans for exposed docs and flags endpoints with broken access controls—before attackers find them. [...]