A cross-site scripting (XSS) vulnerability in the View Filters page (viewfilterspage.php) and Edit Filter page (managefiltereditpage.php) in MantisBT 2.1.0 through 2.17.0 allows remote attackers to inject arbitrary code (if CSP settings permit it) through a crafted PATHINFO. NOTE: this vulnerability exists because of an incomplete fix for CVE-2018-13055.