The website excludes a certain UTM analytics parameter.
Lab: Parameter cloaking
This lab is vulnerable to web cache poisoning because it excludes a certain parameter from the cache key. There is also inconsistent parameter parsing between the cache and the back-end. A user regularly visits this site's home page using Chrome.
To solve the lab, use the parameter cloaking technique to poison the cache with a response that executes alert(1)
in the victim's browser.