Arbitrary File Write Vulnerability in Group-Office by Intermesh
CVE-2026-34838

10CRITICAL

Key Information:

Vendor

Intermesh

Status
Groupoffice
Vendor
CVE Published:
2 April 2026

What is CVE-2026-34838?

Group-Office, an enterprise customer relationship management and groupware tool, contains a vulnerability in its AbstractSettingsCollection model that allows for insecure deserialization. This flaw enables authenticated attackers to inject a serialized FileCookieJar object into a setting string, which can lead to Arbitrary File Write. Consequently, this can facilitate Remote Code Execution (RCE) on the affected server. This timely patching is available in versions 6.8.156, 25.0.90, and 26.0.12, ensuring the integrity and security of enterprise data.

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Deploy the Patch

Affected Version(s)

groupoffice < 6.8.156 < 6.8.156

groupoffice < 25.0.90 < 25.0.90

groupoffice < 26.0.12 < 26.0.12

References

https://github.com/Intermesh/groupoffice/security/advisor...
x_refsource_CONFIRM
https://github.com/Intermesh/groupoffice/releases/tag/v25...
x_refsource_MISC
https://github.com/Intermesh/groupoffice/releases/tag/v26...
x_refsource_MISC

CVSS V3.1

Score:
10
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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