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CVE-2026-73570

Synacor · Zimbra Collaboration Suite (ZCS) · Zimbra Collaboration Suite (ZCS) OS Command Injection Vulnerability

Published · Added to CISA KEV
CVSS8.9
Severityhigh
WeaknessCWE-78
ExploitedYes, in CISA KEV
Ransomware useUnknown
Federal fix dueAug 24, 2026

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L

Description

A remote code execution vulnerability exists in Zimbra Collaboration (ZCS) before 10.1.20 when the optional zimbra-snmp package is installed and SNMP notifications are enabled. Due to improper sanitization of untrusted input during SNMP notification processing, an unauthenticated attacker can send specially crafted SMTP requests that may result in execution of arbitrary operating system commands as the Zimbra user.

Required action (CISA)

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.

References

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Our coverage of CVE-2026-73570

CVE-2026-73570

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Attackers Exploit Zimbra SNMP Flaw for Unauthenticated Remote Code Execution

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