Zimbra

In-Place Upgrade Guide (Single and Multi-Node setup)

A Zimbra license is required to use Zimbra Daffodil (v10). It comes in two Product editions: Professional and Standard. They share common features but Professional has additional features.

Zimbra offers two free guides on securing the Zimbra email platform and patching vulnerabilities.

The page describes how customers across industries address collaboration and productivity challenges.

Zimbra hosts webinars and events demonstrating its email and collaboration system.

An adaptable platform that is designed for extensibility, featuring out-of-the-box integrations with Slack, Dropbox, Zoom and numerous more, allowing partners to bundle with their other products and services

Zimbra provides support through its Support Portal and Customer Feedback Portal.

Zimbra: A Cloud-Hosted Collaboration Software and Email Platform That Integrates With Proprietary Business Solutions

Synacor’s contributor agreement outlines rights granted to the company by contributors.

Zimbra Collaboration Server bundles open-source technologies licensed under standard terms.

1. Definitions 1.1 “Customer” means the person or entity whose authorized agent has orderedSupport Services from Synacor or from an authorized distributor or reseller.

Threat actors exploit a patched vulnerability in **Zimbra Collaboration Suite (ZCS)** to install web shells and steal mailbox data. Microsoft Security Research confirms active attacks targeting the flaw, enabling unauthorized access to sensitive authentication credentials.

Sep 2026The Hacker NewsNews article

Hackers target a critical vulnerability in Zimbra Collaboration Suite to access email backups and authentication credentials of affected organizations. Microsoft reports active exploitation attempts against vulnerable systems. The flaw allows unauthorized access to sensitive email data and login details.

Sep 2026Ars TechnicaNews article

Zimbra releases version 10.1.21 (codenamed *Daffodil*), continuing its long-standing focus on enterprise-grade email infrastructure. The platform serves over **200 million mailboxes** across **6,000+ deployments** in **140+ countries**, underpinning mission-critical communications for global organizations. Each update balances stability with incremental improvements, reinforcing its role as a scalable solution for businesses and partners worldwide.

Sep 2026Zimbra : BlogNews article

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) mandates federal agencies to patch a critical Zimbra vulnerability actively exploited by threat actors. Zimbra’s developer released the fix nearly a month after initially disclosing the flaw, delaying mitigation efforts.

Aug 2026Cybersecurity DiveNews article