MEDIUMVulnerability
Global

Attackers Exploit Zimbra Flaw to Deploy Web Shells and Harvest Authentication Secrets

·Source: The Hacker News

Updated:

Executive Summary

Threat actors have weaponized a now-patched security flaw in Zimbra Collaboration Suite (ZCS) to deploy web shells and access mailbox data, according to findings from the Microsoft Security Research team. The attack exploits CVE-2026-73570 (CVSS score: 8.9), an unauthenticated operating system command injection flaw that can lead to remote code execution when Simple Network Management Protocol

Analysis

Threat actors have weaponized a now-patched security flaw in Zimbra Collaboration Suite (ZCS) to deploy web shells and access mailbox data, according to findings from the Microsoft Security Research team. The attack exploits CVE-2026-73570 (CVSS score: 8.9), an unauthenticated operating system command injection flaw that can lead to remote code execution when Simple Network Management Protocol

Indicators of Compromise (1)

CVE (1)
CVE-2026-73570
NVDMITRE CVE
Source Attribution

Originally published by The Hacker News on Sep 30, 2026.

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