CVE-2025-15556
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.
- Published Feb 3, 2026
- CVSS 7.7 high
- 1.8% chance of exploitation in the next 30 days (EPSS)
- In CISA's Known Exploited Vulnerabilities catalog
- A fix is available
Affected software
In the news
- Quantifying 2026 Routinely Targeted Vulnerabilities (So Far) VulnCheck Blog ·