Rockliffe MailSite Express before 6.1.22, with the option to save login information enabled, saves user passwords in plaintext in cookies, which allows local users to obtain passwords by reading the cookie file, or remote attackers to obtain the cookies via cross-site scripting (XSS) vulnerabilities.

Incomplete blacklist vulnerability in Rockliffe MailSite Express before 6.1.22 allows remote attackers to upload and execute arbitrary script files by giving the files specific extensions, such as (1) .unk, (2) .asa, and possibly (3) .htr and (4) .aspx, which are not filtered like the .asp extension.