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As of 10/24/2026, Zimbra Collaboration Suite (ZCS) recorded 4 security vulnerabilities in the last 90 days, of which 4 are rated High or Critical. None of these vulnerabilities is actively exploited (KEV) according to CISA's catalog. CyStack recommends that organizations and individual users apply patches 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.
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CVE-2026-93647Zimbra Collaboration Suite Classic Web Client Stored Cross-Site Scripting via Crafted Calendar COUNTER Message From AddressCVE-2026-93643Zimbra Collaboration Suite OnlyOffice Integration Path Traversal Leading to Remote Code Execution via Unauthenticated /downloadas RequestCVE-2026-93642Zimbra Collaboration Suite Modern Web Client Stored Cross-Site Scripting via Forged Share InvitationCVE-2026-93641Zimbra Collaboration Suite Classic Web Client Stored Cross-Site Scripting via Forged Share Invitation| 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 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 exploited | FixYes | Published09/25/2026 | SeverityCritical |
CVE-2026-93642Zimbra Collaboration Suite Modern Web Client Stored Cross-Site Scripting via Forged Share Invitation | Exploitation statusNot exploited | FixYes | Published09/25/2026 | SeverityCritical |
CVE-2026-93641Zimbra Collaboration Suite Classic Web Client Stored Cross-Site Scripting via Forged Share Invitation | Exploitation statusNot exploited | FixYes | Published09/25/2026 | SeverityCritical |
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