CVE-2025-15556
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.
How to fix
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CISA due date: Mar 5, 2026- notepad-plus-plus notepad\+\+8.8.9 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| notepad-plus-plus notepad\+\+ | v < 8.8.9 | 8.8.9 |
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Attack Surface Management
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