Is this vulnerability remotely exploitable over the internet?

Yes, provided the Group-Office instance is exposed over the network and an attacker has valid credentials with access to the vulnerable endpoint. The attack is carried out via HTTP(S) requests that supply a crafted tmp_file parameter.

Does exploitation require authentication or special privileges?

The description indicates that an authenticated attacker is needed. Any account that can trigger calls to email/message/tnefAttachmentFromTempFile and control tmp_file could potentially exploit the flaw, even if it is not a highly privileged administrative account.

What is the safest general fix pattern for developers?

Replace shell-based exec calls with safe, parameterized process execution APIs or, ideally, pure language-level operations that do not spawn a shell at all. Enforce strict allowlists and type constraints on any parameters that influence file names or command arguments, and ensure no user-controlled data is ever concatenated into a shell command string.

Severity:

HIGH RISK

(8.8)

OS Command Injection (CWE-78) in Group-Office email/message/tnefAttachmentFromTempFile Endpoint

CVE-2026-25512

Published:

Feb 4, 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-306

CRITICAL RISK

CRITICAL

(9.8)

Missing Authentication for Forgot-Password Email Change API (CWE-306)

Account Takeover / Loss of Account Control

February 17, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Remote Code Execution on the Server Host

February 17, 2026

Vulnerability Type

Category:

OS Command Injection

CWE:

CWE-78

Impact:

Remote Code Execution

Severity:

HIGH RISK

(8.8)

CVSS Version:

3.1

Vulnerability Type

Category:

OS Command Injection

CWE:

CWE-78

Impact:

Remote Code Execution

Severity:

HIGH RISK

(8.8)

CVSS Version:

3.1

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355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

OS Command Injection (CWE-78) in Group-Office email/message/tnefAttachmentFromTempFile Endpoint

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

(9.8)

Missing Authentication for Forgot-Password Email Change API (CWE-306)

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Vulnerability Type

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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