Synacor Zimbra Collaboration Suite (ZCS) Arbitrary File Upload Vulnerability

Added to KEV
2022-10-20
Federal due date
2022-11-10
Vendor
Synacor
Product
Zimbra Collaboration Suite (ZCS)
EPSS
99.9th percentile (score 0.940, as of 2026-06-08)
NVD CVSS v3.1
Ransomware use
Unknown
Upstream
https://nvd.nist.gov/vuln/detail/CVE-2022-41352

CISA short description

Synacor Zimbra Collaboration Suite (ZCS) allows an attacker to upload arbitrary files using cpio package to gain incorrect access to any other user accounts.

Required action

Apply updates per vendor instructions.

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.