CVE-2025-15556
Notepad++ < 8.8.9 WinGUp Updater Lacks Update Integrity Verification
- State
- Published
- Severity
- 7.7 High
- Published
- Feb 3, 2026
- Updated
- Mar 5, 2026
- Reserved
- Feb 2, 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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 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 | VulnCheck |
Weaknesses
- CWE-494 Download of Code Without Integrity Check
Affected Products
| Product | Versions |
|---|---|
notepad-plus-plusnotepad-plus-plus |
|
References
- https://community.notepad-plus-plus.org/topic/27298/notepad-v8-8-9-vulnerability-fixrelease-notespatch
- https://notepad-plus-plus.org/news/hijacked-incident-info-update/vendor-advisory
- https://github.com/notepad-plus-plus/notepad-plus-plus/commit/bcf2aa68ef414338d717e20e059459570ed6c5abpatch
- https://github.com/notepad-plus-plus/wingup/commit/ce0037549995ed0396cc363544d14b3425614fdbpatch
- https://www.vulncheck.com/advisories/notepad-plus-plus-wingup-updater-lacks-update-integrity-verificationthird-party-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-15556government-resource
- https://notepad-plus-plus.org//news//clarification-security-incident/third-party-advisory
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