CVE-2026-27947 Details
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.
A critical authenticated remote code execution vulnerability has been identified in Group-Office versions through 26.0.7, 25.0.86, and 6.8.153. The issue arises in the TNEF attachment processing flow, where attacker-controlled files are extracted from 'winmail.dat' and processed with the 'zip' command using shell wildcards. This exploitation allows for arbitrary command execution on the server.
Users can upgrade to Group-Office versions 26.0.9, 25.0.87, or 6.8.154 to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 3, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/Intermesh/groupoffice/security/advisories/GHSA-2rwh-9qp7-f92x | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-434 | Unrestricted Upload of File with Dangerous Type | [email protected] |
| CWE-88 | Improper Neutralization of Argument Delimiters in a Command ('Argument Injection') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| intermesh group-office | < 6.8.154 >= 25.0.1, < 25.0.87 >= 26.0.1, < 26.0.9 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Mar 4, 2026 | Initial Analysis | [email protected] |
| Feb 27, 2026 | New CVE Received | [email protected] |