PHP file inclusion in Zimbra Collaboration - CVE-2025-68645
Published: November 6, 2025 / Updated: January 23, 2026
Vulnerability identifier: #VU118168
CSH Severity: Critical
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Red
CVE-ID: CVE-2025-68645
CWE-ID: CWE-98
Exploitation vector: Remote access
Exploit availability:
The vulnerability is being exploited in the wild
Vendor: Synacor Inc.
Affected software:
Zimbra Collaboration
Zimbra Collaboration
Detailed vulnerability description
The vulnerability allows a remote attacker to include and execute arbitrary PHP files on the server.
The vulnerability exists due to incorrect input validation when including PHP files in the RestFilter. A remote non-authenticated attacker can send a specially crafted HTTP request to the affected application, include and execute arbitrary PHP code on the system with privileges of the web server.
How to mitigate CVE-2025-68645
Install updates from vendor's website.