CVE-2025-15556
Notepad++ Notepad++
Notepad++ Download of Code Without Integrity Check Vulnerability
What it is
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.
What to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Vendor notices and references
- notepad-plus-plus.org/news/clarification-security-incident/
- community.notepad-plus-plus.org/topic/27298/notepad-v8-8-9-vulnerability-fix
- nvd.nist.gov/vuln/detail/CVE-2025-15556
Description and required action as published by CISA. Full record at NVD.