CVE-2026-27947
February 27, 2026
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.
Affected Packages
https://github.com/Intermesh/groupoffice.git (GITHUB):
Affected version(s) >=v6.2.85 <v6.8.154Fix Suggestion:
Update to version v6.8.154https://github.com/Intermesh/groupoffice.git (GITHUB):
Affected version(s) >=v26.0.1 <v26.0.9Fix Suggestion:
Update to version v26.0.9https://github.com/Intermesh/groupoffice.git (GITHUB):
Affected version(s) >=v25.0.1 <v25.0.87Fix Suggestion:
Update to version v25.0.87Related Resources (1)
Do you need more information?
Contact UsCVSS v4
Base Score:
9.4
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
HIGH
Subsequent System Integrity
HIGH
Subsequent System Availability
HIGH
CVSS v3
Base Score:
9.9
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
EPSS
Base Score:
0.30
