Notepad++ Download of Code Without Integrity Check Vulnerability

Technical Severity

CVSS v3.1 Metrics

HIGH

7.5 / 10

Minimal Risk Critical

Vector Specification

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploitation Likelihood

EPSS Prediction

2.69 %

Predictive Probability

Percentile Rank

85.6 th

Documented as more likely to be exploited than 85.6% of known CVEs.

Detection Date

Feb 12, 2026

Remediation Due

Mar 05, 2026

CISA Catalog Active

Threat Analysis

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.

Remediation Directive

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

External Intelligence

https://notepad-plus-plus.org/news/clarification-security-incident/

https://community.notepad-plus-plus.org/topic/27298/notepad-v8-8-9-vulnerability-fix

NVD

National Vulnerability Database

https://nvd.nist.gov/vuln/detail/CVE-2025-15556