CVE WatchAug 4, 2026

CVE-2022-37042

Synacor Zimbra Collaboration Suite (ZCS) Authentication Bypass Vulnerability

CVSS

9.8

Critical

EPSS

91.9%

p100

KEV

YES

Aug 11, 2022

Exploit Today

0-100

Published: Aug 12, 2022 · Last modified: Aug 4, 2026 · CWE-22

EPSS · 30d

88.8%EPSS · 30 days91.9%

2026-08-022026-08-30

KEV catalog record

Product

Synacor / Zimbra Collaboration Suite (ZCS)

Vulnerability

Synacor Zimbra Collaboration Suite (ZCS) Authentication Bypass Vulnerability

Added to KEV

Aug 11, 2022

Remediate by

Sep 1, 2022

Known ransomware use

Yes

Summary description

Synacor Zimbra Collaboration Suite (ZCS) contains an authentication bypass vulnerability in MailboxImportServlet. This vulnerability was chained with CVE-2022-27925 which allows for unauthenticated remote code execution.

Required action

Apply updates per vendor instructions.

Notes

https://blog.zimbra.com/2022/08/authentication-bypass-in-mailboximportservlet-vulnerability/; https://nvd.nist.gov/vuln/detail/CVE-2022-37042

Technical description

Zimbra Collaboration Suite (ZCS) 8.8.15 and 9.0 has mboximport functionality that receives a ZIP archive and extracts files from it. By bypassing authentication (i.e., not having an authtoken), an attacker can upload arbitrary files to the system, leading to directory traversal and remote code execution. NOTE: this issue exists because of an incomplete fix for CVE-2022-27925.

Official references

Related CVEs

CVECVSSEPSSKEVRExploitTitleMod.

CVE-2026-82673—

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