CVE-2025-68645: Synacor Zimbra Collaboration Suite (ZCS) PHP Remote File Inclusion Vulnerability

High severity, CVSS 8.8. Actively exploited: in CISA KEV since 2026-01-22. EPSS: 48.9% chance of exploitation in the next 30 days.

A Local File Inclusion (LFI) vulnerability exists in the Webmail Classic UI of Zimbra Collaboration (ZCS) 10.0 and 10.1 because of improper handling of user-supplied request parameters in the RestFilter servlet. An unauthenticated remote attacker can craft requests to the /h/rest endpoint to influence internal request dispatching, allowing inclusion of arbitrary files from the WebRoot directory.

Affected products

• Synacor Zimbra Collaboration Suite: from 10.0.0, before 10.0.18 (fixed in 10.0.18); from 10.1.0, before 10.1.13 (fixed in 10.1.13)

Published 2025-12-22. Last modified 2026-06-17.