Zimbra Collaboration Suite (ZCS) OS Command Injection Vulnerability

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• NewsExploited · CISA KEVSynacor · Zimbra Collaboration Suite (ZCS)

  Zimbra Collaboration Suite (ZCS) OS Command Injection Vulnerability

  CVE-2026-73570

  Zimbra Collaboration Suite (ZCS) contains an OS command injection vulnerability which could allow an unauthenticated attacker to send specially crafted SMTP requests that may result in execution of arbitrary operating system commands as the Zimbra user.

  CISA's required action · due 24 Aug 2026 for U.S. federal civilian agencies

  Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

  Cited by CISA: wiki.zimbra.com · blog.zimbra.com · nvd.nist.gov

  Added to KEV 21 Aug 2026 · Source checked 4 Nov 2026, 16:30 UTC · CISA KEV entry

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