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Vulnerability

CVE-2026-73570 — Zimbra Collaboration Suite (ZCS) OS Command Injection Vulnerability

Exploited in the wild 2 stories · 2 outlets

Official record (cve.org)NVDCVE watch

Impacted if

Synacor Zimbra Collaboration Suite (ZCS)

CISA Known Exploited Vulnerabilities

Added on 2026-08-21, federal remediation due 2026-08-24. 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.

Required action: 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.

First seen by AX-NEWS · latest story . Severity: NVD, or the CVE record while the NVD has not scored it. This product uses data from the NVD API but is not endorsed or certified by the NVD.

Coverage

  1. Zimbra Vulnerability Exploited in the Wild Prior to Public Disclosure
    USSecurityWeek Cybersecurity

    Under certain conditions, CVE-2026-73570 can be exploited via specially crafted emails without user interaction. The post Zimbra Vulnerability Exploited in the Wild Prior to Public Disclosure appeared first on SecurityWeek .

  2. Attackers Exploit Zimbra Flaw to Deploy Web Shells and Harvest Authentication Secrets
    INThe Hacker News Cybersecurity

    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…