CISA Known Exploited Vulnerability

This vulnerability is actively exploited in the wild and listed in the CISA Known Exploited Vulnerabilities catalog.

Remediation Deadline: Mar 5, 2026

High

CISA KEV

CVE-2025-15556

Notepad++—Notepad++

Notepad++ when using the WinGUp updater, contains a download of code without integrity check vulnerability that could allow an attacker to intercept or redirect update traffic to download and execute an attacker-controlled installer. This could lead to arbitrary code execution with the privileges of the user.

Required Action

https://notepad-plus-plus.org/news/clarification-security-incident/ ; https://community.notepad-plus-plus.org/topic/27298/notepad-v8-8-9-vulnerability-fix ; https://nvd.nist.gov/vuln/detail/CVE-2025-15556

Vulnerability Overview

Severity: High
CISA KEV: Yes
Ransomware: Unknown
Published: Feb 12, 2026
KEV Added: Feb 12, 2026
Due Date: Mar 5, 2026
Related Articles: 0

Vendor

Notepad++