PT-2026-5735 · Notepad Plus Plus · Notepad-Plus-Plus

Published 2026-02-03 · Updated 2026-02-03 · CVE-2025-15556

Mitre

CVSS v4.0

7.7

7.7

High

Base vector

AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Notepad++ versions prior to 8.8.9, when using the WinGUp updater, contain an update integrity verification vulnerability where downloaded update metadata and installers are not cryptographically verified. An attacker able to intercept or redirect update traffic can cause the updater to download and execute an attacker-controlled installer, resulting in arbitrary code execution with the privileges of the user.

Fix

Weakness Enumeration

CWE-494

Related Identifiers

CVE-2025-15556

Affected Products

Notepad-Plus-Plus

References · 6

• https://github.com/notepad-plus-plus/wingup/commit/ce0037549995ed0396cc363544d14b3425614fdb · Patch
• https://community.notepad-plus-plus.org/topic/27298/notepad-v8-8-9-vulnerability-fix · Patch
• https://github.com/notepad-plus-plus/notepad-plus-plus/commit/bcf2aa68ef414338d717e20e059459570ed6c5ab · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2025-15556 · Security Note
• https://notepad-plus-plus.org/news/hijacked-incident-info-update · Vendor Advisory
• https://vulncheck.com/advisories/notepad-plus-plus-wingup-updater-lacks-update-integrity-verification · Note