CVE-2026-73570
Hackers breached over 270 Zimbra servers in ongoing attacks
Threat actors have already compromised over 270 Zimbra instances in remote code execution attacks targeting a high-severity Zimbra Collaboration Suite (ZCS) vulnerability. The ZCS email and collaboration suite is used by hundreds of millions of people and organizations, including thousands of businesses and hundreds of government agencies worldwide. Synacor patched the security flaw (tracked as CVE-2026-73570), […]
CISA orders urgent patching of actively exploited Zimbra flaw
The Cybersecurity and Infrastructure Security Agency (CISA) has ordered U.S. government agencies to patch an actively exploited vulnerability in Zimbra Collaboration Suite (ZCS) within three days. The Zimbra security team patched the security flaw (tracked as CVE-2026-73570) in version 10.1.20, released on July 20. Successful exploitation allows unauthenticated attackers to gain remote code execution by exploiting a […]
Critical Zimbra RCE flaw now actively exploited in attacks
CERT Polska, the Polish Computer Emergency Response Team (CERT), warned that attackers have begun exploiting a critical vulnerability in Zimbra Collaboration Suite (ZCS). ZCS is a popular email and collaboration software suite used by hundreds of millions of people and organizations worldwide, including thousands of businesses and hundreds of government agencies. The Zimbra security team released […]