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9.3

Zimbra Modern Web client lets forged share read mailbox

CVE-2026-93642 · published 6 days ago
Summary

A fake share invitation can be sent to a Zimbra user who is logged in. When the user clicks the invitation, hidden code runs and the attacker can view the user's email and act on their behalf. Install the latest Zimbra updates or patches to stop this from happening.

What to do
  • Update zimbra zimbra collaboration suite (zcs) to version 10.1.21 or later.
Affected software
VendorProductAffected versions
zimbra zimbra collaboration suite (zcs) < 10.1.21
Original advisory text
Zimbra Collaboration Suite Modern Web Client Stored Cross-Site Scripting via Forged Share Invitation
An unauthenticated sender can forge a share notification that triggers stored XSS when a signed-in Zimbra Modern recipient clicks Accept Share, allowing the attacker to access mailbox data and act as the victim.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit (estimated)
  • Gives an attacker full control (estimated)
Severity
9.3 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-79Cross-site Scripting (XSS)
Timeline
Published25 Sep 2026
Updated27 Sep 2026
First seen25 Sep 2026
Sources
CVE-2026-93642 · NVD
CVE-2026-93642 · MITRE
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