Mass-Scanning Campaign Exploits Vite Flaw to Extract Cloud Credentials From Exposed Dev Servers

Attackers are mass-scanning for internet-exposed Vite development servers vulnerable to CVE-2026-39364, exploiting a query parameter manipulation flaw to bypass security restrictions and exfiltrate cloud credentials, AWS/Azure configurations, and infrastructure state files. The root problem is twofold: unpatched development tooling and the critical mistake of exposing dev servers directly to the internet, a practice never intended for production or public-facing environments. Development tools like Vite are built for local use and lack the hardening of production-grade software, making them high-value, low-resistance targets. This incident highlights that cloud credential exposure can cascade into full infrastructure compromise, making the blast radius of a seemingly 'dev environment' breach catastrophic.