Hackers have been exploiting a critical vulnerability in the Zimbra Collaboration Suite in an attempt to obtain email backups and authentication credentials of vulnerable organzations, Microsoft has warned . The vulnerability, tracked as CVE 2026 73570, lets attackers remotely issue operating system commands without authentication. Zimbra maintainer Synacor issued a patch on July 20, but didnt disclose the vulnerability for more than three weeks after that. The security focused Shadowserver...