
Security Vulnerabilities Every Developer Should Know (OWASP Top 10 Simplified)
Most developers know they should "write secure code." But when asked what that means specifically, the answer gets vague fast. The OWASP Top 10 is the industry standard list of critical web application security risks. But the official documentation is dense and aimed at security professionals. This guide translates each vulnerability into vulnerable code vs. fixed code examples that any developer can understand and act on. A01: Broken Access Control The problem: Users can act outside their intended permissions — viewing other users' data, modifying records they don't own, or escalating privileges. This is the #1 vulnerability on the OWASP list, and it's surprisingly common. // VULNERABLE: Any authenticated user can view any profile app . get ( ' /api/users/:id ' , auth , ( req , res ) => { const user = db . getUser ( req . params . id ); res . json ( user ); }); // FIXED: Verify resource ownership app . get ( ' /api/users/:id ' , auth , ( req , res ) => { if ( req . user . id !== req .
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