High · published February 3, 2026
CVSS calls it high at 7.7. It is confirmed in active exploitation. It sits in the 78.0th percentile for exploit probability.
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.