Fraud Detection and Threat Detection in OutSystems Reactive Web Application

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Mohammad Iqbal Yusuf Sheikh

Question

Reactive

Development

Application Type

Reactive

Hello Community,

I am exploring options for implementing fraud detection and threat detection mechanisms in an OutSystems Reactive Web application.

I am looking for implementation approaches, architecture ideas, POC examples, or reusable components that can help detect suspicious user activities and generate fraud alerts.

Some questions I have:

How do you detect fraudulent or suspicious user activities in real time?
What approaches have you used to identify potential security threats or application misuse?
Has anyone implemented a custom solution within OutSystems to automatically detect fraud patterns, generate alerts, and notify support or security teams?
If so, could you share your implementation approach, architecture, tools used, and any lessons learned?

Any insights, recommendations, or experiences would be greatly appreciated.

Thank you.

4 days ago

Samuel Espinoza

Hey @Mohammad Iqbal Yusuf Sheikh so there're documentation about security best practices

For example:

The OWASP Top 10 https://success.outsystems.com/support/security/develop_secure_outsystems_apps/how_outsystems_helps_you_address_owasp_top_10/
Also Outsytems has documentation about Security best practices like https://success.outsystems.com/documentation/11/security/best_practices_for_reactive_web_security/
Always validate input data on the server-side — never rely only on client-side validations. Use GetUserId() and CheckRole() to ensure Aggregates and SQL Queries only return data for the authenticated user. Use SanitizeHTML from the Sanitization.
Depending on the use case you could also add reCAPTCHA for example if its necessary.
Maybe you can also check Rate Limiting — you can handle this by adding an entity that stores the user and the IP. There are some docs on this and you can probably find a Forge component too.
And it's always a good idea to validate logs or have alerts for monitoring.

From personal experience, having pentesters validate deployments before going to production makes a huge difference — not just for catching vulnerabilities, but also for building a security-aware development culture within the team.

One thing that's often overlooked in fraud detection discussions: not all threats come from external users. A significant portion of fraud and data misuse originates from internal users or employees, that's why audit logs help to track this.

4 days ago

Manish Jawla

MVP

Hi @Mohammad Iqbal Yusuf Sheikh ,

OutSystems gives you a solid security foundation, but fraud detection usually requires additional measures on top of the platform's built-in capabilities.

I'd recommend combining strong authentication and authorization, server-side validation, activity monitoring, and centralized logging.

Look for unusual patterns such as repeated failed logins, suspicious transaction behaviour, unexpected location changes, or unusually high request volumes.

In most cases, fraud detection depends more on the business rules and use case than on the platform itself.

OutSystems can help you collect signals and enforce controls, but the fraud detection logic needs to be tailored to your application's specific risks.

What type of fraud are you trying to detect? if you can provide some example that will be helpful in determining the approach, because there is no one size fit all.

Regards,

Manish Jawla

3 days ago

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