Software development is changing rapidly.

AI coding assistants are helping developers write code faster. AI agents are beginning to interact with APIs, databases, cloud services, and internal tools. Modern applications are also becoming more connected through third-party integrations, open-source dependencies, and distributed infrastructure.

These changes create new opportunities, but they also expand the attack surface.

A vulnerability is no longer limited to a piece of application code. It can originate from a compromised dependency, an exposed developer token, an insecure API integration, an overprivileged AI agent, or a misconfigured cloud service.

The challenge is that many traditional security practices were designed for a different development environment.

Security can no longer be treated as a final checklist before deployment. It needs to be part of how we design, build, test, deploy, and operate software.

Here are six security practices developers should prioritize in 2026.

1.…