Cross-site scripting (XSS) vulnerability in core/summary_api.php in MantisBT before 1.2.3 allows remote attackers to inject arbitrary web script or HTML via the Summary field, a different vector than CVE-2010-3303.

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.

Cross-site scripting (XSS) vulnerability in MantisBT before 1.2.2 allows remote authenticated users to inject arbitrary web script or HTML via an HTML document with a .gif filename extension, related to inline attachments.

Cross-site scripting (XSS) vulnerability in manage_proj_cat_add.php in MantisBT 1.2.2 allows remote authenticated administrators to inject arbitrary web script or HTML via the name parameter in an Add Category action.

Mantis 1.1.x through 1.1.2 and 1.2.x through 1.2.0a2 does not set the secure flag for the session cookie in an https session, which can cause the cookie to be sent in http requests and make it easier for remote attackers to capture this cookie.