Russia-Linked APT28 Exploited MDaemon Zero-Day to Hack Government Webmail Servers

A Russia-linked threat actor has been attributed to a cyber espionage operation targeting webmail servers such as Roundcube, Horde, MDaemon, and Zimbra via cross-site scripting XSS vulnerabilities, including a then-zero-day in MDaemon, according to new findings from ESET. The activity, which...