CVE-2025-15556

Notepad++ · Published February 3, 2026

7.5

CVSS v3.1

HIGH

CISA KEV — Federal agencies must patch by deadline

Actively exploited in the wild

Patch availableGet patch

Description

Notepad++ versions prior to 8.8.9, when using the WinGUp updater, contain an update integrity verification vulnerability where downloaded update metadata and installers are not cryptographically verified. An attacker able to intercept or redirect update traffic can cause the updater to download and execute an attacker-controlled installer, resulting in arbitrary code execution with the privileges of the user.

Affected Products

Notepad\+\+ < 8.8.9

CVSS Vector

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