CVE WatchAug 4, 2026

CVE-2022-27925

Synacor Zimbra Collaboration Suite (ZCS) Arbitrary File Upload Vulnerability

CVSS

7.2

High

EPSS

98.7%

p100

KEV

YES

Aug 11, 2022

Exploit Today

0-100

Published: Apr 21, 2022 · Last modified: Aug 4, 2026 · CWE-22

EPSS · 30d

98.6%EPSS · 30 days98.7%

2026-08-022026-08-30

KEV catalog record

Product

Synacor / Zimbra Collaboration Suite (ZCS)

Vulnerability

Synacor Zimbra Collaboration Suite (ZCS) Arbitrary File Upload Vulnerability

Added to KEV

Aug 11, 2022

Remediate by

Sep 1, 2022

Known ransomware use

Yes

Summary description

Synacor Zimbra Collaboration Suite (ZCS) contains flaw in the mboximport functionality, allowing an authenticated attacker to upload arbitrary files to perform remote code execution. This vulnerability was chained with CVE-2022-37042 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-2022-27925

Technical description

Zimbra Collaboration (aka ZCS) 8.8.15 and 9.0 has mboximport functionality that receives a ZIP archive and extracts files from it. An authenticated user with administrator rights has the ability to upload arbitrary files to the system, leading to directory traversal.

Official references

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