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CVE-2026-20841— Windows Notepad App Remote Code Execution Vulnerability

Quick assessment

Affected
Microsoft Windows Notepad
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Microsoft Windows Notepad是美国微软（Microsoft）公司的一个文本编辑程序。 Microsoft Windows Notepad存在命令注入漏洞。攻击者利用该漏洞可以远程执行代码。

CVSS 7.8 · High EPSS 9.01% · P95

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
Microsoft Windows Notepad 11.0.0< 11.2512.26.0 affected
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I. Basic Information for CVE-2026-20841

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Windows Notepad App Remote Code Execution Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Improper neutralization of special elements used in a command ('command injection') in Windows Notepad App allows an unauthorized attacker to execute code locally.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
在命令中使用的特殊元素转义处理不恰当(命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Windows Notepad 命令注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Windows Notepad是美国微软（Microsoft）公司的一个文本编辑程序。 Microsoft Windows Notepad存在命令注入漏洞。攻击者利用该漏洞可以远程执行代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Microsoft Windows Notepad 11.0.0 ~ 11.2512.26.0 -

II. Public POCs for CVE-2026-20841

# POC Description Source Link Shenlong Link
1 PoC https://github.com/BTtea/CVE-2026-20841-PoC POC Details
2 CVE-2026-20841 - Windows notepad.exe RCE https://github.com/RajaUzairAbdullah/CVE-2026-20841 POC Details
3 PoC for the "Windows Notepad RCE" https://github.com/tangent65536/CVE-2026-20841 POC Details
4 None https://github.com/patchpoint/CVE-2026-20841 POC Details
5 None https://github.com/uky007/CVE-2026-20841_notepad_analysis POC Details
6 None https://github.com/atiilla/CVE-2026-20841 POC Details
7 CVE-2026-20841 https://github.com/dogukankurnaz/CVE-2026-20841-PoC POC Details
8 PoC for a remote code execution flaw in Windows Notepad's markdown renderer. The markdown engine does not restrict URL protocols, allowing arbitrary protocol handlers to be triggered via clickable links https://github.com/SecureWithUmer/CVE-2026-20841 POC Details
9 Proof of Concept for CVE-2026-20841 https://github.com/hackfaiz/CVE-2026-20841-PoC POC Details
10 None https://github.com/EleniChristopoulou/PoC-CVE-2026-20841 POC Details
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III. Intelligence Information for CVE-2026-20841

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Same Patch Batch · Microsoft · 2026-02-10 · 54 CVEs total

CVE-2026-21531 9.8 CRITICAL Azure SDK for Python Remote Code Execution Vulnerability
CVE-2026-21537 8.8 HIGH Microsoft Defender for Endpoint Linux Extension Remote Code Execution Vulnerability
CVE-2026-21510 8.8 HIGH Windows Shell Security Feature Bypass Vulnerability
CVE-2026-21516 8.8 HIGH GitHub Copilot for Jetbrains Remote Code Execution Vulnerability
CVE-2026-21513 8.8 HIGH MSHTML Framework Security Feature Bypass Vulnerability
CVE-2026-21255 8.8 HIGH Windows Hyper-V Security Feature Bypass Vulnerability
CVE-2026-21518 8.8 HIGH GitHub Copilot and Visual Studio Code Security Feature Bypass Vulnerability
CVE-2026-21256 8.8 HIGH GitHub Copilot and Visual Studio Remote Code Execution Vulnerability
CVE-2026-21228 8.1 HIGH Azure Local Remote Code Execution Vulnerability
CVE-2026-21257 8.0 HIGH GitHub Copilot and Visual Studio Elevation of Privilege Vulnerability
CVE-2026-21229 8.0 HIGH Power BI Remote Code Execution Vulnerability
CVE-2026-21523 8.0 HIGH GitHub Copilot and Visual Studio Code Remote Code Execution Vulnerability
CVE-2026-21250 7.8 HIGH Windows HTTP.sys Elevation of Privilege Vulnerability
CVE-2026-21259 7.8 HIGH Microsoft Excel Elevation of Privilege Vulnerability
CVE-2026-21533 7.8 HIGH Windows Remote Desktop Services Elevation of Privilege Vulnerability
CVE-2026-21514 7.8 HIGH Microsoft Word Security Feature Bypass Vulnerability
CVE-2026-21231 7.8 HIGH Windows Kernel Elevation of Privilege Vulnerability
CVE-2026-21238 7.8 HIGH Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
CVE-2026-21236 7.8 HIGH Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
CVE-2026-21239 7.8 HIGH Windows Kernel Elevation of Privilege Vulnerability

Showing top 20 of 54 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same vendor: Microsoft
Same weakness: CWE-77

V. Comments for CVE-2026-20841

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