A cross-site scripting (XSS) vulnerability in the MantisBT (2.3.x before 2.3.2) Timeline include page used in My View (my_view_page.php) and User Information (view_user_page.php) pages allows remote attackers to inject arbitrary code (if CSP settings permit it) through crafted PATH_INFO in a URL due to use of unsanitized $_SERVER'PHP_SELF' to generate URLs.