Synacor Zimbra Collaboration Suite (ZCS) PHP Remote File Inclusion Vulnerability

Added to KEV
2026-01-22
Federal due date
2026-02-12
Vendor
Synacor
Product
Zimbra Collaboration Suite (ZCS)
EPSS
97.8th percentile (score 0.476, as of 2026-06-08)
NVD CVSS v3.1
Ransomware use
Unknown
Upstream
https://nvd.nist.gov/vuln/detail/CVE-2025-68645

CISA short description

Synacor Zimbra Collaboration Suite (ZCS) contains a PHP remote file inclusion vulnerability that could allow for remote attackers to craft requests to the /h/rest endpoint to influence internal request dispatching, allowing inclusion of arbitrary files from the WebRoot directory.

Required action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

EPSS percentile is the FIRST.org exploit-probability ranking as of the date noted above; it moves daily. CVSS reflects NVD's analysis at time of publication.