Occurred Aug 21, 2026, 12:00:00 AM UTC

First published Oct 27, 2026, 8:10:16 PM UTC · Last updated Oct 27, 2026, 8:10:16 PM UTC

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

Reported by CISA Known Exploited Vulnerabilities

The source describes a vulnerability that could let an unauthenticated attacker use crafted SMTP requests to execute operating-system commands as the Zimbra user. It calls for mitigations under vendor instructions and applicable CISA guidance, or discontinuing use if mitigations are unavailable.

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Why it matters

The source specifies mitigation steps for affected assets but does not report exploitation or realized impacts.

Generated scores

Scores are based on the cited reporting and use a 1–10 scale. Read the methodology.

Confidence: 5/10How certain the assessment is based on the clarity and evidence in the cited reporting.
Geographic reach: 1/10How widely the event reaches, from a local area (1) to worldwide impact (10).
Global importance: 2/10The event's broader significance, from limited importance (1) to major global importance (10).
Impact magnitude: 2/10The scale or severity of the real-world impact, from minor (1) to extreme (10).
Urgency: 5/10How time-sensitive the event is, from low urgency (1) to immediate attention needed (10).

Primary official sources

CISA Known Exploited Vulnerabilities CVE-2026-73570: Zimbra Collaboration Suite (ZCS) OS Command Injection Vulnerability

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