Directory traversal vulnerability in nph-mr.cgi in Mailreader.com 2.3.20 through 2.3.31 allows remote attackers to view arbitrary files via .. (dot dot) sequences and a null byte (%00) in the configLanguage parameter.

compose.cgi in Mailreader.com 2.3.30 and 2.3.31, when using Sendmail as the Mail Transfer Agent, allows remote attackers to execute arbitrary commands via shell metacharacters in the RealEmail configuration variable, which is used to call Sendmail in network.cgi.

Cross-site scripting (XSS) vulnerability in network.cgi in mailreader before 2.3.29 earlier allows remote attackers to inject arbitrary web script or HTML via MIME text/enriched or text/richtext messages.