CVE-2025-15556

HighCVSS 7.5/10Known exploited (CISA KEV)Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-494

Affected software

Vendor	Product	Versions
notepad-plus-plus	notepad-plus-plus	< 8.8.9

References

https://community.notepad-plus-plus.org/topic/27298/notepad-v8-8-9-vulnerability-fixRelease Notes
https://github.com/notepad-plus-plus/notepad-plus-plus/commit/bcf2aa68ef414338d717e20e059459570ed6c5abPatch
https://github.com/notepad-plus-plus/wingup/commit/ce0037549995ed0396cc363544d14b3425614fdbPatch
https://notepad-plus-plus.org/news/hijacked-incident-info-update/Patch, Vendor Advisory
https://www.vulncheck.com/advisories/notepad-plus-plus-wingup-updater-lacks-update-integrity-verificationThird Party Advisory
https://notepad-plus-plus.org//news//clarification-security-incident/Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-15556US Government Resource

Timeline

Published: Feb 3, 2026
Last modified: Jun 17, 2026
Added to CISA KEV: Feb 12, 2026
NVD status: Analyzed

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