---
id: "CVE-2025-15556"
kind: "vulnerability"
aliases: ["CVE-2025-15556"]
title: "notepad-plus-plus notepad\\+\\+: Notepad++ versions prior to 8.8.9, when using the WinGUp updater, contain an update integrity verification\u2026"
severity: "high"
cvss: 7.7
epss: null
exploited: true
status: "open"
category: "other"
products: [{"name": "Notepad++ Notepad++", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "notepad-plus-plus notepad\\+\\+", "fixed": ["8.8.9"], "affected": "< 8.8.9", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["exploited", "notepad++", "other", "windows"]
not_affected_if: ["unknown"]
published_at: "2026-02-03T01:15:57+00:00"
first_seen_at: "2026-10-23T19:11:51+00:00"
updated_at: "2026-10-23T23:44:51+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2025-15556", "first_seen_at": "2026-10-23T19:11:51+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-15556", "first_seen_at": "2026-10-23T23:44:51+00:00"}]
---

# notepad-plus-plus notepad\+\+: Notepad++ versions prior to 8.8.9, when using the WinGUp updater, contain an update integrity verification…

Notepad++ updater (WinGUp) downloads update installers without verifying their integrity, so traffic can be intercepted or redirected. An attacker who controls that path can get a malicious installer run on the machine with the user's privileges.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Notepad++ Notepad++ affected ? fixed ?
- vendor:notepad-plus-plus notepad\+\+ affected < 8.8.9 fixed 8.8.9

## Fix

Apply the vendor mitigations per CISA guidance; the sources do not name a fixed version or specific setting. If no mitigation is available, stop using Notepad++.

## Timeline

- 2026-10-23T19:11:51+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2025-15556
- 2026-10-23T23:44:51+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2025-15556

## From the sources

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.

CISA 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.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_