CVE-2026-20841 Details
Description
Improper neutralization of special elements used in a command ('command injection') in Windows Notepad App allows an unauthorized attacker to execute code locally.
A command injection vulnerability has been identified in the Windows Notepad App. This issue allows an unauthorized attacker to execute code remotely by exploiting improper neutralization of special elements used in commands. The vulnerability affects users who open Markdown files containing malicious links, which can trigger the execution of remote files via unverified protocols. The executed code runs in the context of the user who opened the file, potentially leading to unauthorized actions with the user's permissions.
Users can download the security update for Windows Notepad from the Microsoft Store.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Feb 11, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://news.ycombinator.com/item?id=46971516 | CVE | Issue Tracking |
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20841 | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-77 | Improper Neutralization of Special Elements used in a Command ('Command Injection') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| microsoft windows notepad | < 11.2510 |
CPE
Remediation
| |
Change History
6 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Feb 25, 2026 | Initial Analysis | [email protected] |
| Feb 12, 2026 | CVE Modified | [email protected] |
| Feb 11, 2026 | CVE Modified | CVE |
| Feb 10, 2026 | New CVE Received | [email protected] |