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CISA orders urgent patching of actively exploited Zimbra flaw
CVE-2026-73570
August 24, 2026 · BleepingComputer · Severity: CRITICAL
The Cybersecurity and Infrastructure Security Agency has ordered federal agencies to patch a Zimbra Collaboration Suite vulnerability that is being actively exploited. CVE-2026-73570 has been added to CISA’s Known Exploited Vulnerabilities catalog, requiring U.S. government agencies to apply patches within three days. Shadowserver reports over 270 compromised Zimbra instances, highlighting the urgency for all organizations to remediate immediately. 📌 **Analyst Note:** This CVE is confirmed actively exploited in the wild. Apply patches immediately and monitor for indicators of compromise.
Key Takeaways
- Critical vulnerability allows remote attackers to fully compromise Zimbra email servers.
- Exploitation is actively occurring in the wild via unauthenticated remote code execution.
- Affected versions are unspecified; users should apply the latest Zimbra patch immediately.
- CISA orders federal agencies to patch within three days; all organizations should remediate now.