CVE-2017-6534
A Cross-Site Scripting (XSS) issue was discovered in webpagetest 3.0. The vulnerability exists due to insufficient filtration of user-supplied data (pssid) passed to the webpagetest-master/www/pss.php URL. An attacker could execute arbitrary HTML and script code in a browser in the context of the vulnerable website.
Source: CVE-2017-6534