Detect SSRF Attacks in HTML Text in C#
Malicious users are spending more time crafting customized attacks, which is bad news for online applications who rely on firewalls and anti-virus software to catch the majority of threats. Attackers can search site and database structures for vulnerabilities and exploit them in a variety of ways; one popular method is via server-side request forgery (SSRF) attacks. If server side input validations are missing, this provides an opportunity for a user to inject arbitrary HTML code, execute it on the server, and obtain access to sensitive data. However, by using the following API in C#, you can detect SSRF attacks from HTML text input and avoid this unsafe situation.
Our first step is to install the .NET Framework by running this command:
Install-Package Cloudmersive.APIClient.NET.Validate -Version 3.2.0
After the installation, we can add the user-facing text input and call the function with the following code:
using Cloudmersive.APIClient.NET.Validate.Model;namespace Example
public class TextInputCheckHtmlSsrfExample
public void main()
// Configure API key authorization: Apikey
Configuration.Default.AddApiKey("Apikey", "YOUR_API_KEY");var apiInstance = new TextInputApi();
var value = value_example; // string | User-facing HTML input.try
// Protect html input from Server-side Request Forgery (SSRF) attacks
HtmlSsrfDetectionResult result = apiInstance.TextInputCheckHtmlSsrf(value);
catch (Exception e)
Debug.Print("Exception when calling TextInputApi.TextInputCheckHtmlSsrf: " + e.Message );
To retrieve an API key, visit the Cloudmersive website to register for a free account; this will give you access to 800 calls/month across our entire library of APIs.