CVE-2021-35207: Zimbra Collaboration

Medium severity, CVSS 6.1. EPSS: 3.3% chance of exploitation in the next 30 days.

An issue was discovered in Zimbra Collaboration Suite 8.8 before 8.8.15 Patch 23 and 9.0 before 9.0.0 Patch 16. An XSS vulnerability exists in the login component of Zimbra Web Client, in which an attacker can execute arbitrary JavaScript by adding executable JavaScript to the loginErrorCode parameter of the login url.

Affected products

• Zimbra Collaboration: from 8.8, before 8.8.15 (fixed in 8.8.15); version 8.8.15 only; version 9.0.0 only

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