CVE-2022-27925: Synacor Zimbra Collaboration Suite (ZCS) Arbitrary File Upload Vulnerability

High severity, CVSS 7.2. Actively exploited: in CISA KEV since 2022-08-11. EPSS: 98.7% chance of exploitation in the next 30 days.

Zimbra Collaboration (aka ZCS) 8.8.15 and 9.0 has mboximport functionality that receives a ZIP archive and extracts files from it. An authenticated user with administrator rights has the ability to upload arbitrary files to the system, leading to directory traversal.

Affected products

• Synacor Zimbra Collaboration Suite: version 8.8.15 only; version 9.0.0 only

Published 2022-04-21. Last modified 2026-10-01.