Zimbra XSS via forged share notification (CVE-2026-93642)
CVE-2026-93642 Published on September 25, 2026
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.
Vulnerability Analysis
CVE-2026-93642 is exploitable with network access, requires user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality and integrity, and no impact on availability.
Weakness Type
What is a XSS Vulnerability?
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
CVE-2026-93642 has been classified to as a XSS vulnerability or weakness.
Products Associated with CVE-2026-93642
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Affected Versions
Zimbra Collaboration Suite (ZCS):- Before 10.1.21 is affected.