CVE-2026-20841
Windows Notepad App Remote Code Execution Vulnerability
- Published
- Feb 10, 2026
- Updated
- Aug 19, 2026
- Assigning CNA
- microsoft
- Evidence observed
- Aug 6, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HModerate · next 30 days
- Percentile
- 96.0%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
Improper neutralization of special elements used in a command ('command injection') in Windows Notepad App allows an unauthorized attacker to execute code locally.
Sources
13Proof-of-concept exploit for CVE-2026-20841, a Windows Notepad RCE via markdown links. Generates crafted .md files to trigger remote payloads, app sideloading, or local binary execution.
🛠 Demonstrate remote code execution in Windows Notepad via markdown links exploiting unsecured URL protocols.
Technical analysis and proof-of-concept for a command injection vulnerability in Windows Notepad's markdown rendering, triggered via Control+Click on crafted links, with discussion of exploitation scenarios and mitigations.
Responsible use
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