# CVE-2025-15556

## Summary

- **CVE ID:** CVE-2025-15556
- **Severity:** HIGH
- **CVSS Score:** 7.7 (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)
- **CWE:** CWE-494
- **Published:** Feb 3, 2026
- **Last Modified:** Mar 5, 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.

## Affected Products

- notepad-plus-plus — notepad-plus-plus (0)

## References

- [CNA](https://community.notepad-plus-plus.org/topic/27298/notepad-v8-8-9-vulnerability-fix)
- [CNA](https://notepad-plus-plus.org/news/hijacked-incident-info-update/)
- [CNA](https://github.com/notepad-plus-plus/notepad-plus-plus/commit/bcf2aa68ef414338d717e20e059459570ed6c5ab)
- [CNA](https://github.com/notepad-plus-plus/wingup/commit/ce0037549995ed0396cc363544d14b3425614fdb)
- [CNA](https://www.vulncheck.com/advisories/notepad-plus-plus-wingup-updater-lacks-update-integrity-verification)
- [CISA-ADP](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-15556)
- [CISA-ADP](https://notepad-plus-plus.org//news//clarification-security-incident/)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 1.71%
- **EPSS Percentile:** 75.8

## Known Exploited Vulnerabilities (KEV)

- **Date Added:** Feb 12, 2026
- **Due Date:** Mar 5, 2026

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._