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CVE-2025-15556 Details

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.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.

URL	Source(s)	Tag(s)
https://notepad-plus-plus.org//news//clarification-security-incident/	CISA-ADP	Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-15556	CISA-ADP	US Government Resource
https://community.notepad-plus-plus.org/topic/27298/notepad-v8-8-9-vulnerability-fix	[email protected]	Release Notes
https://github.com/notepad-plus-plus/notepad-plus-plus/commit/bcf2aa68ef414338d717e20e059459570ed6c5ab	[email protected]	Patch
https://github.com/notepad-plus-plus/wingup/commit/ce0037549995ed0396cc363544d14b3425614fdb	[email protected]	Patch
https://notepad-plus-plus.org/news/hijacked-incident-info-update/	[email protected]	PatchVendor Advisory
https://www.vulncheck.com/advisories/notepad-plus-plus-wingup-updater-lacks-update-integrity-verification	[email protected]	Third Party Advisory

see all 7 references

This CVE is in CISA's Known Exploited Vulnerabilities Catalog

Reference CISA's BOD 22-01 and Known Exploited Vulnerabilities Catalog for further guidance and requirements.

Vulnerability Name	Date Added	Due Date	Required Action
Notepad++ Download of Code Without Integrity Check Vulnerability	Feb 12, 2026	Mar 5, 2026	Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-494	Download of Code Without Integrity Check	[email protected]

Affected Products

Product	Versions
notepad-plus-plus notepad++	< 8.8.9
CPE cpe:2.3:a:notepad-plus-plus:notepad++:::::::: Remediation No remediation found in references.

Change History

5 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
Feb 13, 2026	Initial Analysis	[email protected]
Feb 12, 2026	CVE Modified	CISA-ADP
Feb 3, 2026	New CVE Received	[email protected]