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Overview
Synacor is the vendor maintaining Zimbra Collaboration Suite (ZCS), an open-source email and collaboration platform widely deployed in government, education, and enterprise environments.
Recent Developments
- 2026-09-30: Microsoft confirmed active exploitation of CVE-2026-73570 in ZCS; Synacor had patched on 2026-07-20 but public disclosure was delayed more than three weeks, widening the exploitation window (2026-09-30-zimbra-cve-2026-73570-exploitation)
- 2026-08: Shadowserver tracked 274 compromised instances; internet-facing ZCS count dropped from ~19,000 to ~10,000 post-patch