Check Point Advisories

Microsoft Windows Notepad Command Injection (CVE-2026-20841)

Check Point Reference: CPAI-2026-2077
Date Published: 5 Apr 2026
Severity: High
Last Updated: Sunday 05 April, 2026
Source:
Industry Reference:CVE-2026-20841
Protection Provided by:

Security Gateway
R81, R80, R77, R75
Who is Vulnerable? Microsoft Windows Notepad prior to 11.2510
Vulnerability Description A command injection vulnerability in Microsoft Windows Notepad allows unauthorized attackers to execute code locally.

Protection Overview

This protection detects attempts to exploit this vulnerability.

In order for the protection to be activated, update your Security Gateway product to the latest IPS update. For information on how to update IPS, go to SBP-2006-05, click on Protection tab and select the version of your choice.

Security Gateway R81 / R80 / R77 / R75

  1. In the IPS tab, click Protections and find the Microsoft Windows Notepad Command Injection (CVE-2026-20841) protection using the Search tool and Edit the protection's settings.
  2. Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name:  Microsoft Windows Operating System.
Attack Information:  Microsoft Windows Notepad Command Injection (CVE-2026-20841)

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