Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Notepad-Plus-Plus | Notepad\+\+ | < 8.8.9 |
Related Weaknesses (CWE)
References
- https://community.notepad-plus-plus.org/topic/27298/notepad-v8-8-9-vulnerabilityRelease Notes
- https://github.com/notepad-plus-plus/notepad-plus-plus/commit/bcf2aa68ef414338d7Patch
- https://github.com/notepad-plus-plus/wingup/commit/ce0037549995ed0396cc363544d14Patch
- https://notepad-plus-plus.org/news/hijacked-incident-info-update/PatchVendor Advisory
- https://www.vulncheck.com/advisories/notepad-plus-plus-wingup-updater-lacks-updaThird 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-US Government Resource
FAQ
What is CVE-2025-15556?
CVE-2025-15556 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 verif...
How severe is CVE-2025-15556?
CVE-2025-15556 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-15556?
Check the references section above for vendor advisories and patch information. Affected products include: Notepad-Plus-Plus Notepad\+\+.