CVE-2026-27947
Authenticated Remote Code Execution in Group-Office TNEF Processing
Publication date: 2026-02-27
Last updated on: 2026-03-04
Assigner: GitHub, Inc.
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| intermesh | group-office | to 6.8.154 (exc) |
| intermesh | group-office | From 25.0.1 (inc) to 25.0.87 (exc) |
| intermesh | group-office | From 26.0.1 (inc) to 26.0.9 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-88 | The product constructs a string for a command to be executed by a separate component in another control sphere, but it does not properly delimit the intended arguments, options, or switches within that command string. |
| CWE-434 | The product allows the upload or transfer of dangerous file types that are automatically processed within its environment. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability exists in Group-Office, an enterprise customer relationship management and groupware tool, in versions prior to 26.0.9, 25.0.87, and 6.8.154. It is an authenticated Remote Code Execution (RCE) vulnerability occurring in the TNEF attachment processing flow. Specifically, the vulnerable code extracts attacker-controlled files from a winmail.dat attachment and then runs the zip command with a shell wildcard (*). Because the extracted filenames are controlled by the attacker, they can be interpreted as options to the zip command, which allows the attacker to execute arbitrary commands on the system.
How can this vulnerability impact me? :
This vulnerability can lead to remote code execution on the affected system by an authenticated attacker. This means an attacker who can authenticate to the Group-Office application can execute arbitrary commands on the server, potentially leading to full system compromise, data theft, data loss, or disruption of services.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
To mitigate this vulnerability, you should upgrade Group-Office to version 26.0.9, 25.0.87, or 6.8.154 or later, as these versions contain the fix for the authenticated Remote Code Execution vulnerability in the TNEF attachment processing flow.