CVE-2026-20841

highpriority · track · 13EPSS 0.090 · 95 %ileexploit · PoCDEEUNLRUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

14 exploits · PoC

Likely / severe?

9.01% (95th) EPSS

CVSS 8.8 · high

Is it mine?

53 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

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

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedWindows Notepadmsrc_csaf
11.2512.26.0:Security Update:https://apps.microsoft.com/detail/9MSMLRH6LZF3
https://apps.microsoft.com/detail/9MSMLRH6LZF3

cvss

Technical severity, 0–10. One row per scoring source.

8.8

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.18.8highAV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.17.8highCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:Csecondary · ENISA EU

v3.17.8highCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · secure@microsoft.com USexploitability 1.8 · impact 5.9

v3.17.4highCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:Psecondary · CVSS-BT (t0sche)

v3.18.8highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:Csecondary · NCSC-NL NL

v3.17.8highCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:Csecondary · Microsoft Security Response Center US

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-77USCWE-77USCWE-77USCWE-77US

exploits (14)

Public proof-of-concept and weaponised exploit code.

0xBlackash/CVE-2026-20841CVE-2026-20841PoC · poc_in_github
404godd/CVE-2026-20841-PoC🛠 Demonstrate remote code execution in Windows Notepad versions below 11.2510 using the CVE-2026-20841 proof of concept.PoC · poc_in_github
BTtea/CVE-2026-20841-PoCPoCPoC · poc_in_github
EleniChristopoulou/PoC-CVE-2026-20841EleniChristopoulou/PoC-CVE-2026-20841PoC · poc_in_github
RajaUzairAbdullah/CVE-2026-20841CVE-2026-20841 - Windows notepad.exe RCEPoC · poc_in_github
SecureWithUmer/CVE-2026-20841PoC 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 linksPoC · poc_in_github

affected products (53)

Products and version ranges known to be affected.

Microsoft Windows Notepadall versionscert_bundDEcpe:/o:microsoft:windows:notepad
Microsoft Windows Notepad11.0.0 → 11.2512.26.0enisa_euvdEU
Microsoft Corp Windows Notepad11.0.0 → 11.2512fstec_bduRU
Windows Notepadall versionsfixedmsrc_csafUS
Windows Notepad< 11.2512.26.0msrc_csafUS
Microsoft Windows 10 1607≤ vers:unknown/*ncsc_nlNL
Microsoft Windows 10 1809≤ vers:unknown/*ncsc_nlNL
Microsoft Windows 10 21h2≤ vers:unknown/*ncsc_nlNL
Microsoft Windows 10 22h2≤ vers:unknown/*ncsc_nlNL
Microsoft Windows 10 Version 1607≤ vers:unknown/*ncsc_nlNL
Microsoft Windows 10 Version 1607 for 32-bit Systems≤ vers:unknown/*ncsc_nlNL
Microsoft Windows 10 Version 1607 for x64-based Systems≤ vers:unknown/*ncsc_nlNL
Microsoft Windows 10 Version 1809≤ vers:unknown/*ncsc_nlNL
Microsoft Windows 10 Version 1809 for 32-bit Systems≤ vers:unknown/*ncsc_nlNL
Microsoft Windows 10 Version 1809 for x64-based Systems≤ vers:unknown/*ncsc_nlNL
Microsoft Windows 10 Version 21H2≤ vers:unknown/*ncsc_nlNL
Microsoft Windows 10 Version 21H2 for 32-bit Systems≤ vers:unknown/*ncsc_nlNL
Microsoft Windows 10 Version 21H2 for ARM64-based Systems≤ vers:unknown/*ncsc_nlNL
Microsoft Windows 10 Version 21H2 for x64-based Systems≤ vers:unknown/*ncsc_nlNL
Microsoft Windows 10 Version 22H2≤ vers:unknown/*ncsc_nlNL

showing 20 of 53

advisories (3)

Vendor and ecosystem advisories describing this.

NCSC-2026-0053Kwetsbaarheden verholpen in Microsoft WindowsNL2026-02-10csaf · ncsc_nlNL
Microsoft heeft kwetsbaarheden verholpen in Windows.
WID-SEC-W-2026-0365Microsoft Windows Notepad App: Schwachstelle ermöglicht Ausführen von beliebigem Programmcode mit BenutzerrechtenDeutsch2026-02-10csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Microsoft Windows Notepad App ausnutzen, um beliebigen Programmcode mit Benutzerrechten auszuführen.
msrc_CVE-2026-20841Windows Notepad App Remote Code Execution Vulnerability2026-02-10csaf · msrc_csafUS
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund msrc_csaf ncsc_nl NVD CVE.org MITRE

published 2026-02-10modified 2026-06-17

references (5)

External citations — patches, advisories, analysis.

scry

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