Fix Insufficient Logging & Monitoring in Blitz.js
Blitz.js abstracts the RPC layer, which often leads developers to treat mutations as simple function calls rather than exposed network endpoints. Insufficient logging and monitoring in these resolvers mean you won't detect credential stuffing, IDOR attempts, or privilege escalation until the database is dumped. In a 'hacker-style' context: if it doesn't log, it didn't happen—and you're a sitting duck.
The Vulnerable Pattern
export default async function updateSensitiveData(input: any, ctx: Ctx) {
ctx.session.$authorize();
// VULNERABILITY: No logging of the actor, the target, or the outcome.
// An attacker could iterate IDs or brute-force inputs silently.
const record = await db.privateData.update({
where: { id: input.id },
data: { content: input.content },
});
return record;
}The Secure Implementation
To fix insufficient logging, move beyond console.log. 1. Implement structured JSON logging using a library like Pino or Winston. 2. Log every security-critical event: authentication, authorization failures, and data mutations. 3. Include context: userId, resourceId, and request metadata. 4. Set up alerts on your log aggregator (e.g., Datadog, ELK) for 'data_update_failure' spikes, which indicate automated enumeration or exploitation attempts.
import { logger } from 'integrations/logger';export default async function updateSensitiveData(input: any, ctx: Ctx) { ctx.session.$authorize(); const { userId } = ctx.session;
try { const record = await db.privateData.update({ where: { id: input.id }, data: { content: input.content }, });
// SECURE: Structured logging with context for SIEM ingestion logger.info({ event: 'data_update_success', actorId: userId, resourceId: input.id, path: 'mutations/updateSensitiveData' }, `User ${userId} successfully updated resource ${input.id}`); return record;
} catch (error) { logger.warn({ event: ‘data_update_failure’, actorId: userId, resourceId: input.id, error: error.message, severity: ‘HIGH’ },Unauthorized or failed update attempt by User ${userId}); throw error; } }
Your Blitz.js API
might be exposed to Insufficient Logging & Monitoring
74% of Blitz.js apps fail this check. Hackers use automated scanners to find this specific flaw. Check your codebase before they do.
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