Critical

Attackers Exploit Zimbra SNMP Flaw for Unauthenticated Remote Code Execution

The Hacker News

August 20, 2026 at 1:24 PM

Actively Exploited

Overview

A serious vulnerability in Zimbra Collaboration Suite (ZCS) has been found and is currently being exploited by attackers. The flaw, identified as CVE-2026-73570, has a high severity score of 8.9 and allows for unauthenticated remote code execution through command injection. This means that attackers could potentially take control of affected systems without needing any prior authentication. The Polish Computer Emergency Response Team (CERT Polska) has warned users that this vulnerability is actively being exploited in the wild. Organizations using Zimbra are urged to apply the latest security patches immediately to mitigate the risk of attack.

Key Takeaways

Active Exploitation: This vulnerability is being actively exploited by attackers. Immediate action is recommended.
Affected Systems: Zimbra Collaboration Suite (ZCS), affected versions unspecified
Action Required: Users should update to the latest patched version of Zimbra Collaboration Suite as soon as possible to close this vulnerability and prevent exploitation.
Timeline: Newly disclosed

Original Article Summary

A now-patched security flaw impacting Zimbra Collaboration (ZCS) has come under active exploitation in the wild, according to the Polish Computer Emergency Response Team (CERT Polska). The vulnerability in question is CVE-2026-73570 (CVSS score: 8.9), which refers to a case of command injection that can lead to remote code execution. "A remote code execution vulnerability exists in Zimbra

Impact

Zimbra Collaboration Suite (ZCS), affected versions unspecified

Exploitation Status

This vulnerability is confirmed to be actively exploited by attackers in real-world attacks. Organizations should prioritize patching or implementing workarounds immediately.

Timeline

Newly disclosed

Remediation

Users should update to the latest patched version of Zimbra Collaboration Suite as soon as possible to close this vulnerability and prevent exploitation.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to CVE, Exploit, Vulnerability.

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