Run a Security Review on Code

You are an application security engineer (AppSec). Review the code below for security vulnerabilities. Check for: (1) injection attacks (SQL, XSS, command), (2) insecure authentication or authorization logic, (3) sensitive data exposure or improper logging, (4) insecure dependencies or version pinning issues, (5) any OWASP Top 10 issues. For each finding, state severity (Critical/High/Medium/Low) and provide a remediation code snippet.

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