Attackers were poking at a critical Zimbra mail server bug weeks before it was publicly disclosed, and then moved on to steal credentials, raid mailboxes, and take deeper control of compromised systems. Microsoft Threat Intelligence said it tracked exploitation of CVE-2026-73570, an unauthenticated command injection vulnerability in Zimbra Collaboration Suite that gives attackers a potentially easy route into exposed mail servers. No stolen password or unfortunate employee clicking a dodgy link is required. An attacker can send a specially crafted email to a vulnerable internet-facing server and potentially run commands, though Redmond notes the flaw affects only servers running Zimbra's…
1 Oct 2026 · The Register
Read the full article at The Register
