In PEAR HTTP_Request2 before 2.7.0, multiple files in the tests directory, notably tests/_network/getparameters.php and tests/_network/postparameters.php, reflect any GET or POST parameters, leading to XSS.
Accessible test applications can pose a variety of security risks. Since developers or administrators rarely consider that someone besides themselves would even know about the existence of these applications, it is common for them to contain sensitive information or functions.