Fix API Rate Limit Exhaustion in Laravel

API Rate Limit Exhaustion (CWE-770) is a high-impact DoS vector. In Laravel, exposing endpoints without the 'throttle' middleware allows attackers to saturate worker processes or brute-force sensitive logic. To secure the stack, we must implement granular, identity-aware rate limiting at the routing layer.

The Vulnerable Pattern

/* routes/api.php */
// VULNERABLE: No middleware applied. Attacker can spam 10k requests/sec.
Route::post('/v1/data-export', [ExportController::class, 'process']);
/* app/Http/Controllers/ExportController.php */
public function process(Request $request) {
// Heavy resource consumption starts here immediately
return response()->json([‘status’ => ‘Processing…’]);
}

The Secure Implementation

The secure implementation utilizes Laravel's RateLimiter facade to define a 'strict_api' policy. This policy enforces a hard cap of 5 requests per minute, keyed by the User ID (for authenticated sessions) or the IP address (for guests). By applying the 'throttle:strict_api' middleware to the route, the application will automatically return a '429 Too Many Requests' response once the threshold is crossed, preventing resource exhaustion at the application and database layers.

/* app/Providers/RouteServiceProvider.php */
use Illuminate\Cache\RateLimiting\Limit;
use Illuminate\Support\Facades\RateLimiter;
RateLimiter::for(‘strict_api’, function (Request $request) {
return Limit::perMinute(5)->by($request->user()?->id ?: $request->ip());
});
/* routes/api.php */
// SECURE: Throttle middleware applied with a custom limiter
Route::middleware(‘throttle:strict_api’)->post(‘/v1/data-export’, [ExportController::class, ‘process’]);