Big security news for anyone running email infrastructure: on Aug 21, CISA added the Zimbra vulnerability CVE-2026-73570 to its KEV (Known Exploited Vulnerabilities) list. Translation: this isn’t a theoretical “maybe someday” issue anymore—it’s actively being exploited. CISA says it has evidence and ongoing threat context, and it’s giving a hard deadline for US federal agencies: patch and remediate by the 24th. That means the compliance pressure is real, and the window to reduce risk is getting smaller. This flaw is an OS command injection bug. If attackers can trigger it, they may bypass boundaries and escalate toward remote code execution (RCE), enabling malicious activity or higher privileges. The CVSS score is 8.9 (high severity). Zimbra released a patch back in July: version 10.1.20. If you run Zimbra, prioritize checking your deployed version, applying the fix, and validating the patch rollout. Also: review external access logs, investigate suspicious command behavior, and strengthen detection rules to catch lingering sessions or persistence. #CyberSecurity #Zimbra #CISA #KEV #EmailSecurity #VulnerabilityManagement
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