What’s Vulnerable › Vulnerabilities

CVE-2026-73250: Notepad++: Install-time PowerShell command injection through installation path

• Severity: medium (CVSS 5.4 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-11 · updated 2026-09-09
• Weakness: CWE-77

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.

Affected products

• notepad-plus-plus: before 8.9.7

References

• https://github.com/notepad-plus-plus/notepad-plus-plus/commit/3764d5b72664ef95421bc53bcb204f9b977d346b
• https://github.com/notepad-plus-plus/notepad-plus-plus/releases/tag/v8.9.7
• https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-gp2r-262h-9hgf

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