The hidden security cost of AI-generated code (and what to do about it)

TL;DR: AI code assistants — Cursor, Claude Code, Windsurf, Copilot — are reshaping how software gets built. But research shows 24–45% of AI-generated code contains security vulnerabilities . This post breaks down the most common patterns, why they happen, and exactly how to catch them before they hit production. The Vibe Coding Revolution Has a Blind Spot The way software gets built is shifting underneath us. A developer who would have spent two weeks on a full-stack app can now ship it in an afternoon. Prompting has become a core skill. Vibe coding — describing what you want and letting AI write the implementation — is producing real, functional products at a pace nobody predicted. But there's a pattern emerging that deserves attention. In early 2025, researchers at Stanford found that developers using AI assistants produced code with more security vulnerabilities than those writing manually — and were more confident their code was secure. A separate study from the University of Montr