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Critical Zimbra RCE flaw now actively exploited in attacks
August 20, 2026 · BleepingComputer · Severity: CRITICAL
CERT Polska, the Polish Computer Emergency Response Team (CERT), warned that attackers have begun exploiting a critical vulnerability in Zimbra Collaboration Suite (ZCS).
Key Takeaways
- CERT Polska warned that attackers have begun actively exploiting a critical remote code execution vulnerability in Zimbra Collaboration Suite.
- The Zimbra RCE flaw allows unauthenticated attackers to execute arbitrary commands on vulnerable email servers.
- Organizations running Zimbra should apply security patches immediately and monitor for unusual activity indicative of exploitation attempts.