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.
https://github.com/pear/HTTP_Request2/compare/v2.6.0...v2.7.0
https://github.com/pear/HTTP_Request2/commit/265e05f9e08a28a38a57219516a8e4e2dfdbb147
https://github.com/pear/HTTP_Request2/commit/07925aa77e441dba0ff0fa973a09802729cb838f
https://github.com/pear/HTTP_Request2/blob/b1c61b71128045734d757c4d3d436457ace80ea7/package.xml#L24