Risk Letters

Exploited vulnerability

CVE-2025-15556

TLP:CLEAR

Notepad++ Download of Code Without Integrity Check Vulnerability

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.

Facts

  • Vendor: Notepad++
  • Product: Notepad++
  • CVSS: 7.7
  • EPSS (probability of exploitation within 30 days): 1.7 %
  • On CISA's Known Exploited Vulnerabilities list since: 12 February 2026
  • First known exploitation: 12 February 2026
  • CISA's deadline for US federal agencies: 5 March 2026
  • Weakness: CWE-494
  • First seen by Risk Letters: 12 February 2026

Members see which Nordic sectors the flaw hits, and what to do about it.

Get the full brief

Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD