OWASP Top 10 Mitigation in Node.js Applications

What is the OWASP Top 10?

The Open Worldwide Application Security Project (OWASP) publishes a globally recognized list of the 10 most critical security risks to web applications. If your software gets hacked, it is almost certainly due to one of these ten vulnerabilities.

At DevApps Technology, our backend engineering teams are strictly trained to architect Node.js and Next.js applications that are fundamentally immune to these attack vectors by default.

Here is a technical breakdown of how we mitigate the top 3 most dangerous OWASP vulnerabilities.

1. Injection (SQL Injection & NoSQL Injection)

The Threat: An attacker types raw database commands into a login or search field (e.g., ' OR 1=1 --). If the backend concatenates this string directly into a database query, the attacker can bypass authentication or delete your entire database.

The Engineering Mitigation: We absolutely forbid the use of raw string concatenation in database queries.

• Relational (PostgreSQL): We utilize modern ORMs (like Prisma or Drizzle) or Query Builders (like Knex.js). These tools automatically use Parameterized Queries (Prepared Statements). The database driver mathematically separates the SQL code from the user's input, making it impossible for the user's input to be executed as code.
• NoSQL (MongoDB): Attackers use objects to bypass logic (e.g., passing { "$gt": "" } to match all passwords). We use strict schema validation (like Zod or Joi) on all incoming API requests to cast all inputs strictly to strings before they hit the database logic.

2. Broken Access Control (BOLA / IDOR)

The Threat: An attacker logs in as User 1. They notice the URL says /api/invoices/1. They manually change the URL in their browser to /api/invoices/2. Because the server doesn't check if they own Invoice 2, it blindly returns User 2's highly sensitive financial data. This is known as Broken Object Level Authorization (BOLA) or IDOR.

The Engineering Mitigation: Authentication (proving who you are) is not Authorization (proving what you are allowed to see).

• We never rely on frontend UI hiding. We enforce strict Authorization Middleware on every single backend route.
• We utilize Row-Level Security (RLS) in PostgreSQL. Even if the Node.js server asks for Invoice 2, the database kernel intercepts the query, checks the user's JWT tenant_id, and blocks the read if it doesn't match the invoice owner.
• We obfuscate sequential IDs. We never use id = 1, 2, 3 in public URLs. We use long, cryptographically random UUIDs (e.g., /invoices/f47ac10b-58cc-4372-a567-0e02b2c3d479), making it mathematically impossible for an attacker to guess the next invoice number.

3. Cross-Site Scripting (XSS)

The Threat: An attacker pastes malicious JavaScript into a public comment section on your blog. When another user views that comment, the victim's browser executes the JavaScript, which silently steals their session cookies and sends them to the hacker.

The Engineering Mitigation:

• React/Next.js Protections: Modern frontend frameworks like React are inherently secure against standard XSS because they automatically HTML-encode data binding ({commentText}). We strictly forbid the use of dangerouslySetInnerHTML unless the text has been passed through a robust sanitization library like DOMPurify.
• Content Security Policy (CSP): We engineer strict CSP headers sent from the Node.js backend. The CSP tells the browser: "Only execute JavaScript that originates from our exact domain. If you see inline JavaScript embedded in an HTML element, refuse to run it." This provides a bulletproof secondary layer of defense even if a developer makes a mistake in React.
• HttpOnly Cookies: We never store sensitive JWTs or session tokens in localStorage (where XSS scripts can read them). We store them in HttpOnly cookies, which are completely invisible to client-side JavaScript.

Has your software undergone a security audit? Do not wait for a breach to discover vulnerabilities. Contact DevApps Technology to architect secure, OWASP-compliant web applications.