Command Injection Vulnerability in Windows Notepad App by Microsoft
CVE-2026-20841

8.8HIGH

Key Information:

Vendor

Microsoft
Status
Windows Notepad
Vendor
CVE Published:
10 February 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-20841?

The Windows Notepad App has a vulnerability that allows attackers to exploit improper neutralization of special command elements. This security flaw can enable unauthorized users to execute arbitrary code over a network, posing significant risks to systems that rely on this application. Users are advised to apply available patches and follow best practices to mitigate potential exploitation.

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Deploy the Patch

Affected Version(s)

Windows Notepad 11.0.0 < 11.2510

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-20841-PoC
Created by BTtea

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

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