CVE-2025-15556VulnerabilityPublished 02/12/2026Updated 10/24/2026
CVE-2025-15556: Notepad++ Download of Code Without Integrity Check Vulnerability
Affects Notepad++ Notepad++Source CISA KEV
Severity
HighNo CVSS score published yet
- Exploitation
Actively exploited – in CISA KEV since 02/12/2026
- KEV deadline
- 03/05/2026
- EPSS
- 1.8% chance of exploitation in 30 days – higher than 78% of CVEs
What to do
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.
Description
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.
Weaknesses
References
- notepad-plus-plus.org/news/clarification-security-incident/ (opens in a new tab)
- community.notepad-plus-plus.org/topic/27298/notepad-v8-8-9-vulnerability-fix (opens in a new tab)
- nvd.nist.gov/vuln/detail/CVE-2025-15556 (opens in a new tab)
- cisa.gov/known-exploited-vulnerabilities-catalog?search=CVE-2025-15556 (opens in a new tab)