compose.php in @Mail WebMail Client in AtMail Open-Source before 1.05 does not properly handle ../ (dot dot slash) sequences in the unique …

compose.php in @Mail WebMail Client in AtMail Open-Source before 1.05 does not properly handle ../ (dot dot slash) sequences in the unique parameter, which allows remote attackers to conduct directory traversal attacks and read arbitrary files via a ..././ (dot dot dot slash dot slash) sequence.