February 8, 2001. During its research with XML and images, the Center discovered a security problem with Internet Explorer. CCNMTL staff Anders Pearson and Peter Leonard discovered that the security hole affects both Mac (version 5.0) and Windows (version 4.0) and can lead to Web-mail spoofing attacks. The report has been covered by a number of online news sites, including SecurityFocus.com and Macintouch.com.