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fix(security): Secure API Routes against NoSQL Query Injection Attacks #577

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fix(security): Secure API Routes against NoSQL Query Injection Attacks #577

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52c7490
fix(security): Secure API Routes against NoSQL Query Injection Attack…
knoxiboy Jun 12, 2026
a250e5e
fix(security): add express-mongo-sanitize to prevent NoSQL query inje…
knoxiboy Jun 12, 2026
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1 change: 1 addition & 0 deletions backend/package.json
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@
"cors": "^2.8.6",
"dotenv": "^17.4.2",
"express": "^5.2.1",
"express-mongo-sanitize": "^2.2.0",
"express-rate-limit": "^8.5.2",
"google-auth-library": "^10.6.2",
"helmet": "^8.1.0",
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9 changes: 9 additions & 0 deletions backend/src/index.js
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Expand Up @@ -7,6 +7,7 @@ import cookieParser from "cookie-parser";
import helmet from "helmet";
import rateLimit from "express-rate-limit";
import compression from "compression"; // <-- Clean & Simple Import
import mongoSanitize from "express-mongo-sanitize"; // FIX #576: NoSQL injection protection
import path from "path";
import { fileURLToPath } from "url";
import crypto from "crypto";
Expand Down Expand Up @@ -46,6 +47,14 @@ app.use(helmet({ contentSecurityPolicy: false }));
// GSSoC Issue #35 Fix
app.disable("x-powered-by");
app.use(express.json({ limit: "5mb" }));
/**
* SECURITY MIDDLEWARE: NoSQL Injection Prevention (Fix #576)
* Strips MongoDB query operators ($where, $gt, $ne, etc.) from all incoming
* request bodies, query strings, and params — preventing attackers from
* injecting malicious operators like { "email": { "$gt": "" } }.
* replaceWith: '_' replaces dangerous keys with safe underscores.
*/
app.use(mongoSanitize({ replaceWith: "_" }));
app.use(cookieParser()); // Must precede CSRF to parse incoming cookies

/**
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