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Critical Vite Flaw CVE-2026-39364 Exploited in Mass Scan for Cloud Credentials

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F5 Labs recorded roughly 32,000 scanning events in August 2026 targeting exposed Vite development servers running versions 7.x and 8.x, with attackers probing for cloud credentials stored in .env files. The critical vulnerability CVE-2026-39364 allows unauthenticated attackers to bypass Vite's server.fs.deny restrictions and retrieve sensitive files via specially crafted HTTP requests, requiring no user interaction. Targets include development servers publicly reachable on ports such as 5173/TCP, where stolen AWS or Azure credentials could enable full cloud environment takeover. Vite has released patched versions 7.3.2 and 8.0.5, and administrators are urged to update immediately. As a further precaution, development servers should be restricted to localhost or internal networks, since changing ports alone is not considered a sufficient mitigation.

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