Vulnerability record

CVE-2022-41352

Synacor Zimbra Collaboration Suite (ZCS) Arbitrary File Upload Vulnerability

CriticalExploitation confirmedCISA KEV Used by ransomware

What should I do?

This vulnerability is in the CISA Known Exploited Vulnerabilities catalog: attackers are using it. If you run Zimbra Collaboration Suite (ZCS), fix it now.

CISA required action: Apply updates per vendor instructions.

US federal civilian agencies must remediate by Nov 10, 2022.

Patch status

Official fix available since Sep 30, 2026

Apply the vendor's update to every affected system. Check the fixed-in versions below where known.

Basis: NVD patch reference

Patch or advisory on wiki.zimbra.com (opens in a new tab)

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.

Source: NIST National Vulnerability Database. Official vulnerability data, reproduced as published.

Affected products

Products affected by this vulnerability, with versions and the source of each entry
Product	Vendor	Affected versions	Source
Zimbra Collaboration Suite	Synacor	9.0.0; 8.8.15	NVD
Zimbra Collaboration Suite (ZCS)	Synacor	—	KEV

Sources: NVD = NIST National Vulnerability Database; KEV = CISA Known Exploited Vulnerabilities catalog.

Intelligence timeline

Developments from the last 30 days, newest first.

CVSS scoredUpdateKEVSep 30, 2026
CVE-2022-41352 scored CVSS 9.8: Synacor Zimbra Collaboration Suite (ZCS), Synacor Zimbra Collaboration Suite (ZCS) Arbitrary File Upload Vulnerability
CISA lists this as exploited in the wild and known to be used in ransomware campaigns. Unpatched Zimbra Collaboration Suite (ZCS) systems are exposed to active attacks now.
Basis: NIST National Vulnerability Database
Patch releasedUpdateKEVSep 30, 2026
Patch released for CVE-2022-41352: Synacor Zimbra Collaboration Suite (ZCS), Synacor Zimbra Collaboration Suite (ZCS) Arbitrary File Upload Vulnerability
An official fix is now available for Synacor Zimbra Collaboration Suite (ZCS). This vulnerability is being exploited, so apply it promptly.
Basis: NVD patch reference

1 earlier event is available with a subscription. See plans.

Coverage

We have not published a story about this vulnerability yet.

References

wiki.zimbra.com https://wiki.zimbra.com/wiki/Security_Center
nvd.nist.gov https://nvd.nist.gov/vuln/detail/CVE-2022-41352
packetstormsecurity.com http://packetstormsecurity.com/files/169458/Zimbra-Collaboration-Suite-TAR-Path-Traversal.html
forums.zimbra.org https://forums.zimbra.org/viewtopic.php?t=71153&p=306532
wiki.zimbra.com https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
secpod.com https://www.secpod.com/blog/unpatched-rce-bug-in-zimbra-collaboration-suite-exploited-in-wild/
cisa.gov https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-41352