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As of 10/02/2026, within CyStack's analyzed data, Zimbra Collaboration Suite (ZCS) has 4 security vulnerabilities published in the last 90 days. Of these, 4 are rated High or Critical. None of these vulnerabilities is listed in the CISA KEV catalog. CyStack recommends that organizations and individual users remediate applicable vulnerabilities as soon as possible.
CyStack does not yet have sufficient official-source data to identify the latest version of Zimbra Collaboration Suite (ZCS) and determine which vulnerabilities affect that version.
CyStack VulnScan continuously discovers assets, validates vulnerabilities, and helps security teams prioritize remediation across the organization.
Explore CyStack VulnScan| Vulnerability | Exploitation status | Fix | Published | Severity |
|---|---|---|---|---|
CVE-2026-93647Zimbra Collaboration Suite Classic Web Client Stored Cross-Site Scripting via Crafted Calendar COUNTER Message From Address | Exploitation statusNot known exploited | FixYes | Published09/25/2026 | SeverityCritical |
CVE-2026-93643Zimbra Collaboration Suite OnlyOffice Integration Path Traversal Leading to Remote Code Execution via Unauthenticated /downloadas Request | Exploitation statusNot known exploited | FixYes | Published09/25/2026 | SeverityCritical |
CVE-2026-93642Zimbra Collaboration Suite Modern Web Client Stored Cross-Site Scripting via Forged Share Invitation | Exploitation statusNot known exploited | FixYes | Published09/25/2026 | SeverityCritical |
CVE-2026-93641Zimbra Collaboration Suite Classic Web Client Stored Cross-Site Scripting via Forged Share Invitation | Exploitation statusNot known exploited | FixYes | Published09/25/2026 | SeverityCritical |
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