Adversarial Security Review

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Act as an application security reviewer. Find vulnerabilities in this code, ranked by severity.

{{code}}

Context: {{context}}

Check specifically for: injection (SQL/command/template), broken auth or missing authorization, sensitive data exposure, unsafe deserialization, and unvalidated input.

For each finding: the vulnerability, a concrete exploit, the severity, and the fix. If you find nothing, say so plainly.