This article was originally published on AI Study Room . For the full version with working code examples and related articles, visit the original post. Web Security Basics: CORS, CSP, XSS, CSRF — What Every Developer Must Know Security isn't optional — it's part of your job as a developer. Most breaches exploit well-known vulnerabilities that have been understood for years. Here are the five web security threats every developer must understand, with prevention strategies and code examples. The Threat Landscape Attack Severity OWASP Rank What It Does XSS (Cross-Site Scripting) Critical #2 Injects malicious scripts into your pages SQL Injection Critical #3 Executes arbitrary SQL on your database CSRF (Cross-Site Request Forgery) High Dropped Tricks users into performing unwanted actions CORS Misconfiguration High #5 Allows unauthorized cross-origin access Insecure Authentication Critical #1 Weak auth allows account takeover 1.…