CVE WatchSep 10, 2026

CVE-2022-41352

Synacor Zimbra Collaboration Suite (ZCS) Arbitrary File Upload Vulnerability

CVSS

9.8

Critical

EPSS

95.5%

p100

KEV

YES

Oct 20, 2022

Exploit Today

0-100

Published: Sep 26, 2022 · Last modified: Sep 10, 2026 · CWE-22

EPSS · 30d

95.5%EPSS · 30 days95.5%

2026-09-162026-10-14

KEV catalog record

Product

Synacor / Zimbra Collaboration Suite (ZCS)

Vulnerability

Synacor Zimbra Collaboration Suite (ZCS) Arbitrary File Upload Vulnerability

Added to KEV

Oct 20, 2022

Remediate by

Nov 10, 2022

Known ransomware use

Yes

Summary 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.

Notes

https://wiki.zimbra.com/wiki/Security_Center; https://nvd.nist.gov/vuln/detail/CVE-2022-41352

Technical description

An issue was discovered in Zimbra Collaboration (ZCS) 8.8.15 and 9.0. An attacker can upload arbitrary files through amavis via a cpio loophole (extraction to /opt/zimbra/jetty/webapps/zimbra/public) that can lead to incorrect access to any other user accounts. Zimbra recommends pax over cpio. Also, pax is in the prerequisites of Zimbra on Ubuntu; however, pax is no longer part of a default Red Hat installation after RHEL 6 (or CentOS 6). Once pax is installed, amavis automatically prefers it over cpio.

Official references

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