HTTP Method Tampering

Executive Summary:

This report addresses a significant security vulnerability known as HTTP Method Tampering within our application. HTTP Method Tampering occurs when attackers manipulate HTTP requests to change the intended HTTP method (e.g., GET, POST, PUT, DELETE), potentially leading to unauthorized access, data manipulation, or security bypasses. This report aims to detail the vulnerability, its potential impact on our systems and users, and actionable recommendations for mitigation.

Description of the Vulnerability:

HTTP Method Tampering vulnerabilities arise when web applications do not properly validate or enforce the HTTP methods used in client requests. Attackers can exploit these vulnerabilities by tampering with HTTP requests to change the method from its intended value to another, potentially gaining unauthorized access to restricted resources, manipulating data, or bypassing security controls. Common examples include changing a POST request to a GET request to retrieve sensitive data or changing a GET request to a POST request to bypass CSRF protections.


The impact of HTTP Method Tampering vulnerabilities can be significant, leading to unauthorized access, data manipulation, or security bypasses within the application. Attackers can exploit these vulnerabilities to gain access to restricted resources, manipulate data, or perform unauthorized actions on behalf of authenticated users, potentially leading to financial loss, reputational damage, or legal consequences for our organization.


The likelihood of exploitation depends on various factors including the visibility of exposed endpoints, the effectiveness of input validation mechanisms, and the attacker's knowledge and motivation. However, given the prevalence of web applications vulnerable to HTTP Method Tampering and the potential impact on security controls and data integrity, the risk associated with this vulnerability is significant if not properly mitigated.

Steps to Reproduce:

  1. Identify endpoints within the application that process user requests and enforce specific HTTP methods (e.g., GET, POST, PUT, DELETE).
  2. Use a web browser or automated tools to send HTTP requests to the identified endpoints, tampering with the HTTP method used in the requests.
  3. Analyze the application's response and observe if unauthorized access, data manipulation, or security bypasses occur as a result of HTTP Method Tampering.
  4. Determine if security controls such as CSRF protections are bypassed by tampering with HTTP methods.

Recommendations for Developers:

  1. Implement Strict Method Enforcement: Implement strict enforcement of HTTP methods for each endpoint to ensure that only allowed methods are accepted and processed.
  2. Use Anti-CSRF Tokens: Implement anti-CSRF tokens to protect against CSRF attacks and ensure that requests are originated from trusted sources, mitigating the risk of HTTP Method Tampering.


Addressing HTTP Method Tampering vulnerabilities is critical to protecting against unauthorized access, data manipulation, and security bypasses within our application. By implementing strict method enforcement and using anti-CSRF tokens, we can mitigate the risks associated with HTTP Method Tampering and enhance the overall security posture of our systems.