CVE-2021-35208: Zimbra Collaboration

Medium severity, CVSS 5.4. EPSS: 1.3% chance of exploitation in the next 30 days.

An issue was discovered in ZmMailMsgView.js in the Calendar Invite component in Zimbra Collaboration Suite 8.8.x before 8.8.15 Patch 23. An attacker could place HTML containing executable JavaScript inside element attributes. This markup becomes unescaped, causing arbitrary markup to be injected into the document.

Affected products

• Zimbra Collaboration: from 8.8, before 8.8.15 (fixed in 8.8.15); version 8.8.15 only

Published 2021-07-02. Last modified 2026-06-17.