CVE-2025-15556

high

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.

References

https://www.vulncheck.com/advisories/notepad-plus-plus-wingup-updater-lacks-update-integrity-verification

https://notepad-plus-plus.org/news/hijacked-incident-info-update/

https://www.securityweek.com/cisa-warns-of-exploited-solarwinds-notepad-microsoft-vulnerabilities/

https://thehackernews.com/2026/02/researchers-observe-in-wild.html

https://securityaffairs.com/187937/security/u-s-cisa-adds-solarwinds-web-help-desk-notepad-microsoft-configuration-manager-and-apple-devices-flaws-to-its-known-exploited-vulnerabilities-catalog.html

https://www.cisa.gov/news-events/alerts/2026/02/12/cisa-adds-four-known-exploited-vulnerabilities-catalog

https://www.levelblue.com/blogs/spiderlabs-blog/notepad-plus-fuss-notepad-supply-chain-attack-analysis

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-15556

https://notepad-plus-plus.org//news//clarification-security-incident/

https://github.com/notepad-plus-plus/wingup/commit/ce0037549995ed0396cc363544d14b3425614fdb

https://github.com/notepad-plus-plus/notepad-plus-plus/commit/bcf2aa68ef414338d717e20e059459570ed6c5ab

https://community.notepad-plus-plus.org/topic/27298/notepad-v8-8-9-vulnerability-fix

Details

Source: Mitre, NVD

Published: 2026-02-03

Updated: 2026-02-13

Known Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 7.6

Vector: CVSS2#AV:N/AC:H/Au:N/C:C/I:C/A:C

Severity: High

CVSS v3

Base Score: 7.5

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Severity: High

CVSS v4

Base Score: 7.7

Vector: 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

Severity: High

EPSS

EPSS: 0.11094