Absolute path directory traversal vulnerability in (a) MERAK Mail Server for Windows 8.3.8r with before IceWarp Web Mail 5.6.1 and (b) VisNetic MailServer before 8.5.0.5 allows remote attackers to include arbitrary files via a full Windows path and drive letter in the (1) language parameter in accounts/inc/include.php and (2) lang_settings parameter in admin/inc/include.php, which is not properly sanitized by the securepath function, a related issue to CVE-2005-4556.