AUTH-001critical SeverityBroken Authentication & Access Controls
Authentication Middleware Covers All Private API Routes
AI agents create new API routes in subfolders (e.g. app/api/user/settings/route.ts) that bypass the middleware matcher regex.
1-Click Fix Prompt for Cursor & Claude Code
Review my codebase for "Authentication Middleware Covers All Private API Routes" (AUTH-001). Issue: AI agents create new API routes in subfolders (e.g. app/api/user/settings/route.ts) that bypass the middleware matcher regex. Remediation required: Use a strict middleware matcher pattern and perform explicit session checks at the start of every sensitive route handler. 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
AI agents create new API routes in subfolders (e.g. app/api/user/settings/route.ts) that bypass the middleware matcher regex.
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: Authentication Middleware Covers All Private API Routes
// 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: Authentication Middleware Covers All Private API Routes
// 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: Use a strict middleware matcher pattern and perform explicit session checks at the start of every sensitive route handler.
- Search your codebase for pattern matching "Authentication Middleware Covers All Private API Routes".
- Apply the recommended remediation: Use a strict middleware matcher pattern and perform explicit session checks at the start of every sensitive route handler.
- 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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