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CVE-2025-15556

7.5
HIGHCVSS v3.1 Base Score
6.09%
LOW RiskEPSS (91st percentile)
KEV

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: 2/3/2026
Modified: 2/13/2026
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ACTIVELY EXPLOITED IN THE WILD

This vulnerability is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

Vulnerability Name:

Notepad++ Download of Code Without Integrity Check Vulnerability

Vendor / Product:

Notepad++ Notepad++

Required Action:

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

Due Date: 3/5/2026(OVERDUE)
Added to KEV:

2/12/2026

Notes:

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 Summary

CVSS v3 Score

7.5HIGH

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

EPSS Score (Exploitation Probability)

6.09%LOW Exploitation Risk
91st percentile

This vulnerability has a 6.09% probability of being exploited in the next 30 days, ranking higher than 91% of all scored CVEs.

CWE Classification

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Same Weakness Type(CWE-494)

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Similar SeverityHIGH