Support Center

Burp Community

See what our users are saying about Burp Suite:

How do I?

New Post View All

Feature Requests

New Post View All

Burp Extensions

New Post View All

Bug Reports

New Post View All

Burp Suite Documentation

Take a look at our Documentation section for full details about every Burp Suite tool, function and configuration option.

Burp Suite Professional and Community editions Burp Suite Enterprise Edition
Burp Scanner Burp Collaborator
Burp Infiltrator Full Documentation Contents

Burp Extender

Burp Extender lets you extend the functionality of Burp Suite in numerous ways.

Extensions can be written in Java, Python or Ruby.

API documentation Writing your first Burp Suite extension
Sample extensions View community discussions about Extensibility
  1. Support Center
  2. Issue Definitions
  3. Web cache poisoning

Web cache poisoning

Description: Web cache poisoning

Web caches identify resources using a few specific components of each HTTP request, together known as the cache key. Two requests with the same cache key are regarded by the cache as equivalent. The cache key typically includes the request line and Host header, but not any other headers.

Web cache poisoning vulnerabilities arise when an application behind a cache processes input that is not included in the cache key. Attackers may be able to exploit this by sending crafted input to trigger a harmful response that the cache will then save and serve to other users.

The impact is potentially serious as the malicious cached page may be served to a large number of users without other interaction. The threat posed by this vulnerability depends largely on what can be achieved with the input. Often the input can be used to trigger XSS or open redirection. In other cases, it can simply be used to swap pages around.

Remediation: Web cache poisoning

To resolve this issue, either disable support for the affected headers, or disable caching on all affected pages.

If both the affected header and caching behavior are required, configure the cache to ensure that the header is included in the cache key. Depending on which caching solution you use, it might be possible to achieve this using the Vary response header.


Vulnerability classifications

Typical severity


Type index


Burp Scanner

Burp Scanner

This issue - and many more like it - can be found using our web vulnerability scanner

Read more
Get Burp

Get Burp

Scan your web application from just $399.00

Find out more