Multiple cross-site scripting (XSS) vulnerabilities in MantisBT before 1.2.3 allow remote authenticated administrators to inject arbitrary web script or HTML via (1) a plugin name, related to manage_plugin_uninstall.php; (2) an enumeration value or (3) a String value of a custom field, related to core/cfdefs/cfdef_standard.php; or a (4) project or (5) category name to print_all_bug_page_word.php.