AUTH-011high SeverityBroken Authentication & Access Controls
State-Changing Actions Restricted to POST/PUT/DELETE
Agents sometimes create GET endpoints like /api/delete-item?id=123 for convenience, exposing them to prefetching and CSRF.
1-Click Fix Prompt for Cursor & Claude Code
Review my codebase for "State-Changing Actions Restricted to POST/PUT/DELETE" (AUTH-011). Issue: Agents sometimes create GET endpoints like /api/delete-item?id=123 for convenience, exposing them to prefetching and CSRF. Remediation required: Enforce state-changing mutations to POST, PATCH, or DELETE methods with CSRF token verification. Please: 1. Locate any occurrences of this issue across my repository. 2. Refactor the code to follow production standards without breaking existing functionality. 3. Provide a clear command or step to test and verify the fix.
Why AI Assistants Write This Bug
Agents sometimes create GET endpoints like /api/delete-item?id=123 for convenience, exposing them to prefetching and CSRF.
AI code generation prioritizes immediate syntax execution over production edge cases. When an assistant hits an undefined variable or strict type error, it frequently takes the path of least resistance rather than implementing standard pre-launch security patterns.
Code Comparison
Common AI Code PatternVulnerable
// Vulnerable AI-generated pattern for: State-Changing Actions Restricted to POST/PUT/DELETE
// Insecure route handler trusting body user ID (IDOR risk)
export async function POST(req: Request) {
const { userId, newEmail } = await req.json();
// BUG: Any user can modify any other user record!
await db.user.update({ where: { id: userId }, data: { email: newEmail } });
return Response.json({ success: true });
}Launch-Ready Fix
// Production-ready fix for: State-Changing Actions Restricted to POST/PUT/DELETE
// Protected route deriving identity from verified session
export async function POST(req: Request) {
const session = await auth();
if (!session?.user?.id) {
return Response.json({ error: "Unauthorized" }, { status: 401 });
}
const { newEmail } = await req.json();
// Scoped strictly to authenticated session user ID
await db.user.update({ where: { id: session.user.id }, data: { email: newEmail } });
return Response.json({ success: true });
}Remediation & Verification Checklist
Remediation: Enforce state-changing mutations to POST, PATCH, or DELETE methods with CSRF token verification.
- Search your codebase for pattern matching "State-Changing Actions Restricted to POST/PUT/DELETE".
- Apply the recommended remediation: Enforce state-changing mutations to POST, PATCH, or DELETE methods with CSRF token verification.
- Run local build and test commands to ensure no regressions.
- Verify in your browser or with curl that the issue is resolved.
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