CVEvulnerability

CVE-2025-15556

7.7 HIGH Known exploited Published 2026-02-03 Modified 2026-06-17 Official page ↗

CISA Known Exploited Vulnerability

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 KEV: 2026-02-12
Remediation due: 2026-03-05
Ransomware use: Unknown
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.
Notes: https://notepad-plus-plus.org/news/clarification-security-incident/ ; https://community.notepad-plus-plus.org/topic/27298/notepad-v8-8-9-vulnerability-fix ; https://nvd.nist.gov/vuln/detail/CVE-2025-15556

Status: Analyzed
Published: 2026-02-03
Last modified: 2026-06-17
Assigner: [email protected]
CVSS 4.0 ([email protected]): 7.7 HIGH — CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1 ([email protected]): 7.5 HIGH — CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Weaknesses: CWE-494

Description

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.

Affected configurations

• notepad-plus-plus notepad\+\+ (< 8.8.9)

Weakness · CWE (1)

CWE-494 Download of Code Without Integrity Check weakness

References