CVE-2026-77605: Notepad-Plus-Plus

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

Notepad++ is a free and open-source source code editor. Prior to 8.9.8, the Folder as Workspace Run by system action in Notepad++ can resolve a different sibling file than the file selected by the user. When an attacker places a command script whose name is the selected text-file path with .cmd appended, and the user invokes Run by system on the text file on Windows 10 or Windows 11, Notepad++ can execute the sibling script as the current user instead of opening the selected file. This issue is fixed in version 8.9.8.

Affected products

• Notepad-Plus-Plus Notepad-Plus-Plus: before 8.9.8 (fixed in 8.9.8)

Published 2026-09-22. Last modified 2026-09-28.