Notepad++ Download of Code Without Integrity Check Vulnerability. Actively exploited: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 12/02/2026. Patch affected systems as an emergency.
| Package | Affected versions | Patched versions |
|---|---|---|
| notepad++ | < 8.8.9 | 8.8.9 |
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.
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