7 Best Ways to Prevent Business Logic Vulnerabilities in TypeScript ERP

Introduction

Business Logic Vulnerabilities in TypeScript based ERP systems can lead to severe security risks, allowing attackers to exploit workflows and manipulate transactions. Unlike traditional vulnerabilities, these issues stem from flawed business rules rather than insecure coding practices. Attackers leverage loopholes in the logic to bypass restrictions, escalate privileges, or perform unauthorized actions.

In this blog, we’ll discuss how to identify and prevent Business Logic Vulnerabilities in TypeScript-based ERPs with practical coding examples. By the end, you’ll know how to build secure business logic while ensuring data integrity.

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What Are Business Logic Vulnerabilities?

Business logic vulnerabilities occur when attackers exploit application workflows to perform unauthorized actions. These attacks can bypass authentication, modify financial transactions, or grant unauthorized access. Since these issues arise from flawed business rules, automated security tools often fail to detect them.

Common Business Logic Vulnerabilities in TypeScript ERP

1. Flawed authentication checks – Weak or missing verification processes.
2. Privilege escalation – Unauthorized access to restricted features.
3. Workflow manipulation – Skipping or modifying critical approval steps.
4. Data tampering – Altering price, invoice, or discount values.
5. Race conditions – Exploiting system delays to execute multiple actions.
6. Mass assignment attacks – Overwriting sensitive attributes in object models.
7. Improper validation – Accepting invalid input values that break business logic.

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7 Best Ways to Prevent Business Logic Vulnerabilities

1. Secure Role-Based Access Control (RBAC) in TypeScript

RBAC ensures that users can only access functionalities relevant to their role. Without proper implementation, attackers may escalate privileges and access restricted features.

Vulnerable Code Example

class User {
    constructor(public role: string) {}
}

function performAdminAction(user: User) {
    if (user.role) { // ❌ Incorrect check - Any role is allowed
        console.log("Performing admin action");
    }
}

const normalUser = new User("customer");
performAdminAction(normalUser); // Unauthorized access!

Fixed Code Example

class SecureUser {
    constructor(public role: string) {}
}

function performSecureAdminAction(user: SecureUser) {
    if (user.role !== "admin") {
        throw new Error("Unauthorized access!");
    }
    console.log("Admin action executed.");
}

const normalUser = new SecureUser("customer");
performSecureAdminAction(normalUser); // ✅ Access denied

👉 Ensure strict role verification to prevent privilege escalation.

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2. Prevent Mass Assignment Attacks in TypeScript ERP

Mass assignment vulnerabilities occur when users can update sensitive attributes that should be restricted.

Vulnerable Code Example

class Order {
    constructor(public id: number, public price: number, public status: string) {}
}

function updateOrder(orderData: any) {
    let order = new Order(orderData.id, orderData.price, orderData.status);
    console.log("Order updated:", order);
}

updateOrder({ id: 1, price: 10, status: "Shipped" }); // ❌ Attacker modifies status

Fixed Code Example

class SecureOrder {
    constructor(public id: number, public price: number, private status: string) {}

    updatePrice(newPrice: number) {
        if (newPrice < 0) throw new Error("Invalid price update!");
        this.price = newPrice;
    }
}

let order = new SecureOrder(1, 100, "Pending");
order.updatePrice(120); // ✅ Safe operation

👉 Always restrict attribute updates to prevent unauthorized modifications.

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Check Your Website Security in Real-Time

To ensure your website is secure from business logic vulnerabilities, perform a free security scan using our tool:

📸 Below is a screenshot of our free security tool.

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3. Secure Multi-Step Workflows

Complex ERP workflows (e.g., approval processes) are vulnerable if attackers can skip steps or manipulate requests.

Vulnerable Code Example

function processRefund(user: { role: string }, refundApproved: boolean) {
    if (refundApproved) {
        console.log("Refund processed.");
    }
}

processRefund({ role: "customer" }, true); // ❌ Bypassing refund approval!

Fixed Code Example

function processSecureRefund(user: { role: string }, refundApproved: boolean) {
    if (user.role !== "admin" || !refundApproved) {
        throw new Error("Unauthorized refund attempt!");
    }
    console.log("Refund processed securely.");
}

processSecureRefund({ role: "customer" }, true); // ✅ Access denied

👉 Ensure all workflow steps are verified before processing actions.

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4. Implement Strong Input Validation in TypeScript

Weak validation allows malicious inputs to manipulate business logic.

Vulnerable Code Example

function applyDiscount(price: number, discount: any) {
    return price - discount; // ❌ Missing validation
}

console.log(applyDiscount(100, "50")); // Unexpected behavior!

Fixed Code Example

function secureApplyDiscount(price: number, discount: number) {
    if (typeof discount !== "number" || discount < 0) {
        throw new Error("Invalid discount value!");
    }
    return price - discount;
}

console.log(secureApplyDiscount(100, 20)); // ✅ Safe discount calculation

👉 Always validate and sanitize user inputs to prevent logic manipulation.

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Example of a Website Vulnerability Report

📸 Below is a screenshot of a website vulnerability assessment report generated using our free tool to check Website Vulnerability:

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Conclusion

Securing Business Logic Vulnerabilities in TypeScript ERP is critical to preventing unauthorized transactions, data manipulation, and privilege escalation. You can strengthen your ERP system’s security by implementing secure role-based access, workflow validation, input filtering, and multi-step authentication.

📌 For more security best practices, check out our latest blogs:

• Prevent OAuth Misconfiguration in TypeScript
• Unvalidated Redirects and Forwards in TypeScript ERP
• How to Prevent HTTP Parameter Pollution in TypeScript
• Is Your Phone Compromised? Signs of Malware
• Cybersecurity Insights & More

Additionally, if you’re working with OpenCart, read our guide on OAuth Misconfiguration in OpenCart to prevent security breaches.

By following these security measures, your TypeScript ERP will be safer, more resilient, and protected from logic-based attacks. 💡🔒

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