Is this vulnerability remotely exploitable over the internet?

Yes, but it typically requires an authenticated user context in Group-Office. An attacker who can log in or otherwise cause the application to process a crafted `winmail.dat` attachment can remotely trigger the vulnerable TNEF processing path.

What level of access does an attacker need to exploit this?

Exploitation requires the ability to authenticate to Group-Office and supply or trigger processing of a malicious TNEF (`winmail.dat`) file. No direct shell or filesystem access is needed; the exploitation happens through the server-side attachment handling.

What is the safest general fix pattern?

The safest approach is to remove shell-based invocations that combine untrusted filenames and wildcards. Use APIs that pass arguments as arrays, validate and sanitize filenames (or replace them with generated safe names), and ensure external utilities cannot interpret attacker-controlled content as options.

Severity:

HIGH RISK

(8.8)

Command Injection via Shell Metacharacters (CWE-88) in Group-Office TNEF Attachment Processing

CVE-2026-27947

Published:

Feb 27, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-78

CRITICAL RISK

CRITICAL

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Command Injection in MCP Stdio Configuration Validation (CWE-78) in WeKnora

Remote Code Execution

March 7, 2026

CWE-89

CRITICAL RISK

CRITICAL

(9.9)

SQL Injection via PostgreSQL Array/Row Expressions (CWE-89) in WeKnora Query Engine

Remote Code Execution via SQL Injection on the Database Server

March 7, 2026

Vulnerability Type

Category:

Command Injection

CWE:

CWE-88;CWE-434

Impact:

Authenticated Remote Code Execution on the Group-Office server

Severity:

HIGH RISK

(8.8)

CVSS Version:

3.1

Vulnerability Type

Category:

Command Injection

CWE:

CWE-88;CWE-434

Impact:

Authenticated Remote Code Execution on the Group-Office server

Severity:

HIGH RISK

(8.8)

CVSS Version:

3.1

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Ask AI for summary of CodeAnt

Command Injection via Shell Metacharacters (CWE-88) in Group-Office TNEF Attachment Processing

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

CRITICAL RISK

CRITICAL

(9.9)

Command Injection in MCP Stdio Configuration Validation (CWE-78) in WeKnora

CRITICAL RISK

CRITICAL

(9.9)

SQL Injection via PostgreSQL Array/Row Expressions (CWE-89) in WeKnora Query Engine

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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