Deprecated Feature Policy Header Set

The 'Deprecated Feature Policy Header Set' vulnerability refers to the usage of deprecated features in web applications. Deprecated features are those that have been marked as outdated or obsolete and may pose security risks.

The 'Deprecated Feature Policy Header Set' vulnerability refers to the usage of deprecated features in web applications. Deprecated features are those that have been marked as outdated or obsolete and may pose security risks. This vulnerability can be addressed by implementing proper security measures and updating the application to remove deprecated features. In this step-by-step guide, we will walk through the process of fixing the 'Deprecated Feature Policy Header Set' vulnerability in your web application.

Step 1: Understand the Vulnerability

Before taking any corrective actions, it is crucial to have a clear understanding of the vulnerability and its impact. The 'Deprecated Feature Policy Header Set' vulnerability typically arises due to the presence of outdated or insecure features in the web application's codebase. These deprecated features may be susceptible to exploitation, potentially leading to security breaches or data leaks.

Step 2: Identify Deprecated Features

To address the vulnerability effectively, you need to identify the specific deprecated features being used in your web application. This can be done by reviewing the scanner's report, which should provide details about the affected features and the corresponding code snippets.

Step 3: Update or Replace Deprecated Features

Once you have identified the deprecated features, it is necessary to update or replace them with more secure alternatives. This step may involve modifying the affected code sections or implementing new functionalities using recommended methods. Here are a few examples:

  • If the vulnerability is related to an outdated API or library, update it to the latest version that is free from the deprecated feature.
  • If the vulnerability arises from the use of deprecated HTML tags or attributes, replace them with the latest recommended tags or attributes.
  • If the vulnerability stems from deprecated JavaScript functions or methods, update them to modern equivalents or find alternative approaches.

Step 4: Review Codebase

Thoroughly review your web application's codebase to ensure that all instances of the deprecated features have been addressed. Perform an in-depth analysis to identify any missed occurrences or potential vulnerabilities introduced during the fix.

Step 5: Implement Security Best Practices

While fixing the 'Deprecated Feature Policy Header Set' vulnerability, it is an opportune time to reinforce your application's security posture by implementing best practices. Consider the following measures:

  • Apply the principle of least privilege by granting only necessary permissions to different components of your web application.
  • Utilize input validation techniques to prevent common security flaws like cross-site scripting (XSS) and SQL injection.
  • Implement secure coding practices, such as input/output encoding and output escaping, to prevent injection attacks.
  • Enforce strong password policies, including requirements for length, complexity, and regular password changes.
  • Implement proper session management techniques, such as session expiration and secure cookie attributes.
  • Regularly update and patch your web application, including any third-party libraries or frameworks it relies on.

Step 6: Perform Security Testing

After implementing the fixes and security enhancements, conduct thorough security testing to validate the effectiveness of the changes. This testing can include techniques such as penetration testing, vulnerability scanning, and code reviews to identify any remaining vulnerabilities or unintended consequences.

Step 7: Monitor and Maintain Security

Security is an ongoing process, and it is essential to monitor and maintain the security of your web application continuously. Consider implementing mechanisms for log monitoring, intrusion detection, and incident response to promptly address any security-related events.


Fixing the 'Deprecated Feature Policy Header Set' vulnerability requires a systematic approach that involves understanding the vulnerability, identifying deprecated features, updating or replacing them, and implementing security best practices. By following the steps outlined in this guide and staying vigilant about maintaining security, you can significantly reduce the risk of security breaches and protect your web application and its users from potential harm.

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