CVE-2026-27947

Group-Office Vulnerable to Remote Code Execution (RCE)

State: Published
Severity: 9.4 Critical
Published: Feb 27, 2026
Updated: Mar 3, 2026
Reserved: Feb 25, 2026

Description

Group-Office is an enterprise customer relationship management and groupware tool. Versions prior to 26.0.9, 25.0.87, and 6.8.154 have an authenticated Remote Code Execution vulnerability in the TNEF attachment processing flow. The vulnerable path extracts attacker-controlled files from `winmail.dat` and then invokes `zip` with a shell wildcard (`*`). Because extracted filenames are attacker-controlled, they can be interpreted as `zip` options and lead to arbitrary command execution. Versions 26.0.9, 25.0.87, and 6.8.154 fix the issue.

Scores

CVSS	Score	Vector	Source
4.0	9.4 Critical	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H	GitHub_M

Weaknesses

CWE-88 Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')
CWE-434 Unrestricted Upload of File with Dangerous Type

Affected Products

Product	Versions
groupofficeIntermesh	>= 26.0.0, < 26.0.9Affected >= 25.0.0, < 25.0.87Affected < 6.8.154Affected

References

https://github.com/Intermesh/groupoffice/security/advisories/GHSA-2rwh-9qp7-f92x

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