Best 7 Ways to Prevent Session Replay Attack in TypeScript ERP

What is a Session Replay Attack in TypeScript-Based ERP?

A Session Replay Attack in TypeScript-based ERP is a type of cyber attack where an attacker captures and reuses valid user session tokens to gain unauthorized access to an application. In modern ERP (Enterprise Resource Planning) systems developed with TypeScript, which heavily rely on frontend-backend interactions and REST APIs, session hijacking vulnerabilities can pose a critical threat to sensitive business data.

Why Session Replay Attacks Matter in ERP Applications

ERPs manage confidential company data — financial records, customer data, HR info — making them attractive targets. If session tokens are intercepted via insecure connections or poor implementation, attackers can “replay” these tokens and impersonate legitimate users.

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How Session Replay Attacks Happen (With Code Examples)

Let’s break it down with some TypeScript code snippets to illustrate how these attacks can occur and how to prevent them.

🔴 Vulnerable TypeScript Code Example: Token Reuse Without Expiry

// Storing JWT in localStorage (vulnerable to XSS)
localStorage.setItem('auth_token', user.token);

// Sending token in every request without expiration
fetch('/api/user/data', {
  headers: {
    'Authorization': `Bearer ${localStorage.getItem('auth_token')}`
  }
});

This code stores the token in localStorage, making it vulnerable to JavaScript-based attacks like XSS. If the token does not expire soon or isn’t bound to a specific client or IP, attackers can replay it.

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📸 Screenshot of Our Website Vulnerability Scanner Tool Webpage

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✅ Best Practices to Prevent Session Replay Attacks in TypeScript ERP

Here are 7 developer-recommended solutions to prevent session hijacking and replay issues in your ERP system:

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1. Use Secure, HttpOnly Cookies for Session Tokens

// Backend: Express.js example
res.cookie('session_token', token, {
  httpOnly: true,
  secure: true,
  sameSite: 'Strict',
  maxAge: 10 * 60 * 1000 // 10 minutes
});

Why it helps: Cookies with HttpOnly cannot be accessed via JavaScript, reducing XSS risks.

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2. Token Expiry and Rotation

// Backend pseudocode for token renewal
if (isTokenExpiringSoon(token)) {
  const newToken = generateNewToken(user);
  sendTokenToClient(newToken);
}

Short-lived tokens with rotation make old ones useless if intercepted.

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3. IP and Device Fingerprint Binding

// Server-side check
if (session.ip !== request.ip || session.deviceId !== getDeviceFingerprint()) {
  denyRequest();
}

4. Implement Nonce for Every Request

// Add nonce to each request to ensure uniqueness
const nonce = generateNonce();
sessionStorage.setItem('nonce', nonce);

fetch('/api/data', {
  headers: {
    'X-Nonce': nonce
  }
});

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5. Use TLS/HTTPS Everywhere

This is a must-have. Without HTTPS, all traffic can be sniffed and replayed.

# Use Let's Encrypt to get a free SSL cert
sudo certbot --nginx -d yourdomain.com

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6. Monitor Session Behavior with Anomaly Detection

Use tools to flag unusual session behavior, such as:

• Location switching
• Sudden privilege escalation
• Excessive activity in a short period

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7. Invalidate Sessions After Logout or Inactivity

// Backend logout
app.post('/logout', (req, res) => {
  invalidateSession(req.cookies.session_token);
  res.clearCookie('session_token');
});

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📸 Screenshot of a Vulnerability Assessment Report to check Website Security

This report shows how easily session tokens can be exploited if proper mechanisms aren’t implemented.

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Real-Life Impact of Session Replay Attacks

In real enterprise cases, session replay attacks have led to:

• Unauthorized access to payroll data
• Fraudulent purchase orders
• Privilege escalation by impersonating administrators

ERP systems written in TypeScript are often targeted due to reliance on API calls. That’s why every session-related API must be protected against replay vectors.

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Related Reading You Might Like

Here are some of our previous detailed write-ups you should check out:

• 🔗 Prevent CSP Bypass in TypeScript ERP
• 🔗 Prevent XML Injection in TypeScript ERP
• 🔗 Fix Weak API Authentication in TypeScript
• 🔗 Common Security Misconfigurations in ERP
• 🔗 All Cybersecurity Blog Posts

And if you’re working with OpenCart, you might find this helpful:
🔗 Fix Weak API Authentication in OpenCart

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Final Thoughts

Preventing Session Replay Attack in TypeScript-based ERP apps is not just about secure token storage — it’s about layered security. From encrypted sessions and short-lived tokens to fingerprinting and anomaly detection, every step helps secure your enterprise data from session hijacking.

Don’t just test once. Run continuous scans and vulnerability assessments. Try our Free Website Security Tool to scan your ERP system now and get instant reports like the one shown above.

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