CVE-2024-54663: Synacor Zimbra Collaboration Suite

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

An issue was discovered in the Webmail Classic UI in Zimbra Collaboration (ZCS) 9.0 and 10.0 and 10.1. A Local File Inclusion (LFI) vulnerability exists in the /h/rest endpoint, allowing authenticated remote attackers to include and access sensitive files in the WebRoot directory. Exploitation requires a valid auth token and involves crafting a malicious request targeting specific file paths.

Affected products

• Synacor Zimbra Collaboration Suite: from 9.0.0, before 10.0.11 (fixed in 10.0.11); from 10.1.0, before 10.1.3 (fixed in 10.1.3)

Published 2024-12-19. Last modified 2026-06-17.