CVE-2022-24682: Synacor Zimbra Collaborate Suite (ZCS) Cross-Site Scripting Vulnerability

Medium severity, CVSS 6.1. Actively exploited: in CISA KEV since 2022-02-25. EPSS: 30.9% chance of exploitation in the next 30 days.

An issue was discovered in the Calendar feature in Zimbra Collaboration Suite 8.8.x before 8.8.15 patch 30 (update 1), as exploited in the wild starting in December 2021. 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

• Synacor Zimbra Collaboration Suite: from 8.8.0, before 8.8.15 (fixed in 8.8.15); version 8.8.15 only

Published 2022-02-09. Last modified 2026-08-07.