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vulnerability · Thu 13 Aug 2026 · 16:19 UTC

Actively exploited

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

Filed UTCSource ZMB ↗

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.

Signals

as the pipeline stamped them
KEV
Active exploitation (KEV)
What to do
  1. On CISA KEV — actively exploited. Patch immediately.

CISA KEV means this flaw has been seen exploited in real attacks — not predicted, observed. Treat it as urgent regardless of its score.

CVE

KEV from CISA · EPSS from FIRST
CVE ids in this dispatch with their KEV status and EPSS score
IdKEVEPSSReference
CVE-2026-73570KEV72%NVD ↗

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