Fix Shadow API Exposure in Astro
Shadow APIs in Astro occur when internal endpoints are left exposed without proper authentication or when server-side logic is inadvertently leaked through client-side hydration. In a reconnaissance phase, an attacker will map out `src/pages/api` routes that lack middleware protection. If your API routes aren't explicitly gated, they are public-facing, regardless of whether they are linked in your UI.
The Vulnerable Pattern
// src/pages/api/internal-stats.ts
export const GET = async () => {
// VULNERABILITY: No session verification or API key required.
// Any unauthenticated actor can scrape sensitive system metrics.
const stats = await db.metrics.findMany();
return new Response(JSON.stringify(stats), {
status: 200,
headers: { 'Content-Type': 'application/json' }
});
};The Secure Implementation
To eliminate Shadow API exposure, you must implement a Zero Trust architecture at the route level. First, use Astro Middleware (`src/middleware.ts`) to intercept all requests to `/api/*` and validate JWTs or session cookies. Second, ensure that data returned is scoped to the authenticated user's ID to prevent Insecure Direct Object Reference (IDOR) attacks. Finally, use environment variables for sensitive logic and never expose internal database schemas directly to the client.
// src/pages/api/internal-stats.ts import { getSession } from '../lib/auth';export const GET = async ({ request }) => { const session = await getSession(request);
// SECURE: Strict session check and role-based access control (RBAC) if (!session || session.user.role !== ‘admin’) { return new Response(JSON.stringify({ error: ‘Forbidden’ }), { status: 403 }); }
const stats = await db.metrics.findMany(); return new Response(JSON.stringify(stats), { status: 200, headers: { ‘Content-Type’: ‘application/json’, ‘Cache-Control’: ‘no-store’, ‘X-Content-Type-Options’: ‘nosniff’ } }); };
Your Astro API
might be exposed to Shadow API Exposure
74% of Astro apps fail this check. Hackers use automated scanners to find this specific flaw. Check your codebase before they do.
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