CVE-2026-20841
published 2026-02-10CVE-2026-20841: Improper neutralization of special elements used in a command ('command injection') in Windows Notepad App allows an unauthorized attacker to execute code…
PriorityP355high7.8CVSS 3.1
AVLACLPRNUIRSUCHIHAH
EPSS
11.65%
95.5th percentile
Improper neutralization of special elements used in a command ('command injection') in Windows Notepad App allows an unauthorized attacker to execute code locally.
Affected
3 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | windows_notepad | < 11.2510 | 11.2510 |
| microsoft | windows_notepad | >= 11.0.0 < 11.2512.26.0 | 11.2512.26.0 |
| msrc | windows_notepad | — | — |
CVSS provenance
nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
vendor_msrc7.8HIGH
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GHSA
GHSA-9w4f-2qq2-5rc9: Improper neutralization of special elements used in a command ('command injection') in Windows Notepad App allows an unauthorized attacker to execute
ghsa_unreviewed·2026-02-10
CVE-2026-20841 [HIGH] CWE-77 GHSA-9w4f-2qq2-5rc9: Improper neutralization of special elements used in a command ('command injection') in Windows Notepad App allows an unauthorized attacker to execute
Improper neutralization of special elements used in a command ('command injection') in Windows Notepad App allows an unauthorized attacker to execute code over a network.
Microsoft
Windows Notepad App Remote Code Execution Vulnerability
vendor_msrc·2026-02-10·CVSS 7.8
CVE-2026-20841 [HIGH] CWE-77 Windows Notepad App Remote Code Execution Vulnerability
Windows Notepad App Remote Code Execution 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.
FAQ: How could an attacker exploit this vulnerability?
An attacker could trick a user into clicking a malicious link inside a Markdown file opened in Notepad, causing the application to launch unverified protocols that load and execute both remote and local files.
FAQ: According to the CVSS metric, the attack vector is local (AV:L). Why does the CVE title indicate that this is a remote code execution?
The word Remote in the title refers to the location of the attacker. This type of exploit is sometimes referred to as Arbitrary Code Execution (ACE). The attac
No public exploits indexed.
Sophos
February’s Patch Tuesday assumes battle stations
blogs_sophos·2026-02-13
February’s Patch Tuesday assumes battle stations
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Bleepingcomputer
Windows 11 Notepad flaw let files execute silently via Markdown links
blogs_bleepingcomputer·2026-02-11·CVSS 7.8
[HIGH] Windows 11 Notepad flaw let files execute silently via Markdown links
## Windows 11 Notepad flaw let files execute silently via Markdown links
## Lawrence Abrams
However, with the release of Windows 11, Microsoft decided to discontinue WordPad and remove it from Windows.
Instead, Microsoft rewrote Notepad to modernize it so it could act as both a simple text editor and an RTF editor, adding Markdown support that lets you format text and insert clickable links.
Markdown support means Notepad can open, edit, and save Markdown files (.md), which are plain text files that use simple symbols to format text and represent lists or links.
For example, to bold text or create a clickable link, you would add the following markdown text:
**This is bold text**
[Link to BleepingComputer](https://www.bleepingcomputer.com/)
## Microsoft fixes Windows Notepad RCE flaw
Bleepingcomputer
Microsoft February 2026 Patch Tuesday fixes 6 zero-days, 58 flaws
blogs_bleepingcomputer·2026-02-10·CVSS 8.8
[HIGH] Microsoft February 2026 Patch Tuesday fixes 6 zero-days, 58 flaws
## Microsoft February 2026 Patch Tuesday fixes 6 zero-days, 58 flaws
## Lawrence Abrams
25 Elevation of Privilege vulnerabilities
5 Security Feature Bypass vulnerabilities
12 Remote Code Execution vulnerabilities
6 Information Disclosure vulnerabilities
3 Denial of Service vulnerabilities
7 Spoofing vulnerabilities
When BleepingComputer reports on Patch Tuesday security updates, we only count those released by Microsoft today. Therefore, the number of flaws does not include 3 Microsoft Edge flaws fixed earlier this month.
As part of these updates, Microsoft has also begun to roll out updated Secure Boot certificates to replace the original 2011 certificates that are expiring in late June 2026.
"With this update, Windows quality updates include a broad set of targeting data that i
Talos
Microsoft Patch Tuesday for February 2026 — Snort rules and prominent vulnerabilities
blogs_talos·2026-02-10·CVSS 8.8
CVE-2026-21522 [HIGH] Microsoft Patch Tuesday for February 2026 — Snort rules and prominent vulnerabilities
## Microsoft Patch Tuesday for February 2026 — Snort rules and prominent vulnerabilities
Microsoft has released its monthly security update for February 2026, which includes 59 vulnerabilities affecting a range of products, including two that Microsoft marked as “Critical”.
CVE-2026-21522 is a critical elevation of privilege vulnerability affecting Microsoft ACI Confidential Containers. Successful exploitation of this vulnerability could enable an authorized attacker to escalate privileges on affected systems. This vulnerability is not listed as publicly disclosed and received a CVSS 3.1 score of 6.7.
CVE-2026-23655 is a critical information disclosure vulnerability affecting Microsoft ACI Confidential Containers. This vulnerability could enable an authorized attacker to disclose sensit
Talos
Microsoft Patch Tuesday for February 2026 — Snort rules and prominent vulnerabilities
blogs_talos·2026-02-10·CVSS 8.8
CVE-2026-21522 [HIGH] Microsoft Patch Tuesday for February 2026 — Snort rules and prominent vulnerabilities
Microsoft has released its monthly security update for February 2026, which includes 59 vulnerabilities affecting a range of products, including two that Microsoft marked as “Critical”.
CVE-2026-21522 is a critical elevation of privilege vulnerability affecting Microsoft ACI Confidential Containers. Successful exploitation of this vulnerability could enable an authorized attacker to escalate privileges on affected systems. This vulnerability is not listed as publicly disclosed and received a CVSS 3.1 score of 6.7.
CVE-2026-23655 is a critical information disclosure vulnerability affecting Microsoft ACI Confidential Containers. This vulnerability could enable an authorized attacker to disclose sensitive information including secret tokens and keys if successfully exploited. This vulnerabi
Sophos
February’s Patch Tuesday assumes battle stations
blogs_sophos
February’s Patch Tuesday assumes battle stations
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Microsoft on Tuesday released 58 patches affecting 15 product families. Five of the addressed issues, all involving Azure, are considered by Microsoft to be of Critical severity, though only two require urgent attention (more on that below). Fifteen have a CVSS base score of 8.0 or higher, including two with a 9.8 base score. Six are known to be under active exploit in the wild, and three are publicly disclosed (including one not yet known to be under exploit).
At patch time, five CVEs are judged more likely to be exploited in the next 30 days by the company’s estimation, in addition to the six already detected to be so. Various of this month’s issues are amenable to direct detection by Sophos protections, and we include information on those in a table below. The release also
2026-02-10
Published