CVE-2026-65656

Analyzed Analyzed - Analysis Complete

Command Injection in Microsoft Office

Publication date: 2026-08-11

Last updated on: 2026-08-14

Assigner: Microsoft Corporation

Description

Improper neutralization of special elements used in a command ('command injection') in Microsoft Office allows an unauthorized attacker to execute code locally.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-08-11

Last Modified

2026-08-14

Generated

2026-09-01

AI Q&A

2026-08-11

EPSS Evaluated

2026-08-30

NVD

CVE-2026-65656

EUVD

EUVD-2026-56427

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	365_apps	*
microsoft	365_apps	*
microsoft	office_2019	*
microsoft	office_2019	*
microsoft	office_2021	*
microsoft	office_2021	*
microsoft	office_2024	*
microsoft	office_2024	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-77	The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.

Attack-Flow Graph

Executive Summary

This is a command injection vulnerability in Microsoft Office where improper neutralization of special elements allows an attacker to execute arbitrary code locally on a victim's system.

Detection Guidance

Detecting command injection vulnerabilities in Microsoft Office typically involves monitoring for unusual command execution or suspicious processes. Check for unexpected child processes spawned by Office applications using tools like Process Explorer or tasklist commands. Review Office macro logs and recent document modifications for signs of injected commands.

Impact Analysis

An attacker could exploit this to run malicious code on your computer, potentially stealing data, installing malware, or taking control of your system without your knowledge.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR and HIPAA compliance requirements for data protection and security.

Mitigation Strategies

Apply the latest security updates from Microsoft Office immediately. Monitor Microsoft's official advisory for patches and disable macros or untrusted Office add-ins if not required.

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