Matt Wright FormMail 1.9 and earlier allows remote attackers to send spam or anonymous e-mail by injecting a newline character followed by CC:, BCC:, or additional TO: fields in the email and realname CGI variables.

Matt Wright FormMail 1.9 and earlier allows remote attackers to bypass the HTTP_REFERER check and conduct unauthorized activities via (1) a blank referer, (2) a spoofed referer with a trusted domain/URL after the beginning of the referer, or (3) a spoofed referer with a trusted domain/URL in the beginning (hostname) portion of the referer.

Matt Wright's FormMail CGI script allows remote attackers to obtain environmental variables via the env_report parameter.