CVE-2026-73250

medium

Description

Notepad++ is a free and open-source source code editor. Prior to 8.9.7, the Notepad++ Windows 11 x64 and ARM64 installer passes the attacker-influenced installation directory `$INSTDIR` from PowerEditor/installer/nppSetup.nsi into a PowerShell `-Command` string used by RegisterMSIX to invoke Add-AppxPackage, allowing PowerShell subexpression syntax such as `$()` in the installation path to execute commands in the installer's security context when the context menu component is selected. This issue is fixed in version 8.9.7.

References

https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-gp2r-262h-9hgf

https://github.com/notepad-plus-plus/notepad-plus-plus/releases/tag/v8.9.7

https://github.com/notepad-plus-plus/notepad-plus-plus/commit/3764d5b72664ef95421bc53bcb204f9b977d346b

Details

Source: Mitre, NVD

Published: 2026-08-11

Updated: 2026-08-11

Risk Information

CVSS v2

Base Score: 4.6

Vector: CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:P

Severity: Medium

CVSS v3

Base Score: 7.8

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Severity: High

CVSS v4

Base Score: 5.4

Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Severity: Medium

EPSS

EPSS: 0.00129