Vulnerabilities CVE-2026-20841 Detail Undergoing Analysis This CVE record is currently being enriched by team members, this process results in the association of reference link tags, CVSS, CWE, and CPE applicability statement data Description Improper neutralization of special elements used in a command ('command injection') in Windows Notepad App allows an unauthorized attacker to execute code locally. Metrics NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed. CVSS 4.0 Severity and Vector Strings: NIST: NVD N/A NVD assessment not yet provided. CVSS 3.x Severity and Vector Strings: CNA: Microsoft Corporation Base Score: 7.8 HIGH Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H CVSS 2.0 Severity and Vector Strings: NIST: NVD Base Score: N/A NVD assessment not yet provided. References to Advisories, Solutions, and Tools By selecting these links, you will be leaving NIST webspace. We have provided these links to other web sites because they may have information that would be of interest to you. No inferences should be drawn on account of other sites being referenced, or not, from this page. There may be other web sites that are more appropriate for your purpose. NIST does not necessarily endorse the views expressed, or concur with the facts presented on these sites. Further, NIST does not endorse any commercial products that may be mentioned on these sites. Please address comments about this page to [email protected] . URL Source(s) Tag(s) https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20841 Microsoft Corporation https://news.ycombinator.com/item?id=46971516 CVE Weakness Enumeration CWE-ID CWE Name Source CWE-77 Improper Neutralization of Special Elements used in a Command ('Command Injection') Microsoft Corporation Change History 3 change records found show changes CVE Modified by Microsoft Corporation 2/12/2026 3:16:05 PM Action Type Old Value New Value Changed Description 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. Improper neutralization of special elements used in a command ('command injection') in Windows Notepad App allows an unauthorized attacker to execute code locally. Added CVSS V3.1 AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Removed CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H CVE Modified by CVE 2/11/2026 10:16:16 AM Action Type Old Value New Value Added Reference https://news.ycombinator.com/item?id=46971516 New CVE Received from Microsoft Corporation 2/10/2026 1:16:22 PM Action Type Old Value New Value Added Description 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Added CWE CWE-77 Added Reference https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20841 Quick Info CVE Dictionary Entry: CVE-2026-20841 NVD Published Date: 02/10/2026 NVD Last Modified: 02/12/2026 Source: Microsoft Corporation