Bugzilla 2.18.x before 2.18.6, 2.20.x before 2.20.3, 2.22.x before 2.22.1, and 2.23.x before 2.23.3 allow remote attackers to obtain (1) the description of arbitrary attachments by viewing the attachment in "diff" mode in attachment.cgi, and (2) the deadline field by viewing the XML format of the bug in show_bug.cgi.