Formjacking Template

Executive Summary:

This report addresses a significant security threat known as Formjacking within our application. Formjacking occurs when attackers inject malicious code into web forms to steal sensitive information entered by users, such as payment card details or personal information. This report aims to detail the vulnerability, its potential impact on our systems and users, and actionable recommendations for mitigation.

Description of the Vulnerability:

Formjacking attacks typically involve injecting malicious JavaScript code into web forms, either directly through compromised servers or via third-party scripts integrated into web pages. Once injected, this code captures and exfiltrates sensitive information entered by users, such as credit card numbers, personal details, or login credentials, without their knowledge. Attackers then use this stolen information for fraudulent purposes, such as unauthorized transactions or identity theft.


The impact of Formjacking attacks can be severe, leading to financial loss, reputational damage, or legal liabilities for both our organization and affected users. By stealing sensitive information entered into web forms, attackers can compromise user privacy, facilitate fraudulent transactions, or expose individuals to identity theft. The consequences may include financial fraud, regulatory fines, loss of customer trust, and damage to our brand reputation.


The likelihood of exploitation depends on various factors, including the visibility of web forms collecting sensitive information, the security posture of third-party scripts integrated into web pages, and the effectiveness of security controls implemented to detect and prevent Formjacking attacks. However, given the prevalence of Formjacking as a lucrative cybercrime tactic and the ease of injecting malicious code into web forms, the risk associated with this vulnerability is significant if not properly mitigated.

Steps to Reproduce:

  1. Identify web forms within our application that collect sensitive information from users, such as payment card details or personal information.
  2. Inject malicious JavaScript code into these web forms, either directly or through compromised third-party scripts.
  3. Submit test data through the compromised web forms and observe if the injected code successfully captures and exfiltrates sensitive information.
  4. Analyze network traffic or server logs to confirm the exfiltration of stolen data to external destinations controlled by attackers.

Recommendations for Developers:

  1. Implement Content Security Policy (CSP): Use Content Security Policy to restrict the execution of inline scripts and third-party scripts, mitigating the risk of Formjacking attacks by preventing the injection of malicious code into web forms.
  2. Regular Security Audits: Conduct regular security audits of web forms and third-party scripts integrated into web pages to detect and remediate vulnerabilities that could be exploited for Formjacking.


Addressing Formjacking vulnerabilities is critical to protecting user privacy and preventing financial fraud within our application. By implementing Content Security Policy and conducting regular security audits, we can mitigate the risks associated with Formjacking attacks and enhance the overall security posture of our systems.