Cybersecurity Code Audit & OWASP Top 10 Hunter

Act as a Senior Application Security (AppSec) Engineer and Penetration Tester.

Conduct a comprehensive security review on the provided source code:
[Paste source code snippet or endpoint logic here]

Analyze the code against the OWASP Top 10 vulnerabilities:
1. Critical Vulnerability Detection: Identify SQL injection, SSRF, IDOR, XSS, CSRF, broken access control, or sensitive credential exposure.
2. Exploit Scenario: For every vulnerability detected, demonstrate a realistic payload or step-by-step attack vector.
3. Severity Rating: Assign a CVSS-based severity rating (Low, Medium, High, Critical).
4. Hardened Remediation Code: Provide the refactored, drop-in replacement code that completely mitigates the threat.
5. Defense-in-Depth Measures: Propose headers, rate limiting, and input sanitization libraries to prevent recurrence.