Notepad++ Download of Code Without Integrity Check Vulnerability

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. Added to CISA KEV on 2026-02-12 (federal deadline 2026-03-05).

First seen: 12 Feb 2026
Last update: 12 Feb 2026, 12:00 UTC
Identifiers: CVE-2025-15556
Source: CISA KEV

Check this repository for exposure to one security incident from pwned.coffee. Report first, change nothing until I say so.

## Notepad++ Download of Code Without Integrity Check Vulnerability
Severity: high, exploited in the wild. Patch status: patched.
Affected: Notepad++ Notepad++
Ids: CVE-2025-15556

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. Added to CISA KEV on 2026-02-12 (federal deadline 2026-03-05).

## Steps
1. Search the repo, its CI and infra config for Notepad++ Notepad++. If present, report the version in use and whether it's affected.

## Report
A table: file, product or package, version in use, affected yes/no, exact fix. Then anything a human has to check outside the repo.

If you have the pwned.coffee MCP server (https://pwned.coffee/mcp), call lookup_cve("CVE-2025-15556") for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: https://community.notepad-plus-plus.org/topic/27298/notepad-v8-8-9-vulnerability-fix https://notepad-plus-plus.org/news/clarification-security-incident/ https://nvd.nist.gov/vuln/detail/CVE-2025-15556
https://pwned.coffee/i/notepad-download-of-code-without-integrity-check-vulnera-cve-2025-15556

Sources

Totalone hot coffee