Authenticated Remote Code Execution in Group-Office by Intermesh
CVE-2026-27947

9.4CRITICAL

Key Information:

Vendor

Intermesh

Status
Groupoffice
Vendor
CVE Published:
27 February 2026

What is CVE-2026-27947?

Group-Office, an enterprise customer relationship management and groupware tool by Intermesh, is susceptible to an authenticated remote code execution vulnerability in its TNEF attachment processing mechanism. This issue arises when the system processes winmail.dat files, allowing attackers to execute arbitrary commands. Exploitation occurs due to the handling of attacker-controlled file names, which can be misinterpreted as command options, leading to severe security risks. Users are recommended to upgrade to the fixed versions 26.0.9, 25.0.87, or 6.8.154 to mitigate this issue.

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Affected Version(s)

groupoffice >= 26.0.0, < 26.0.9 < 26.0.0, 26.0.9

groupoffice >= 25.0.0, < 25.0.87 < 25.0.0, 25.0.87

groupoffice < 6.8.154 < 6.8.154

References

https://github.com/Intermesh/groupoffice/security/advisor...
x_refsource_CONFIRM

CVSS V4

Score:
9.4
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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