CVE-2025-15556
CISA KEVAs of 2026-02-13, CVE-2025-15556 is a CVSS 7.5 (HIGH-severity) vulnerability. CISA KEV-listed (known exploited). EPSS exploitation probability 5.3%. Threadlinqs Intelligence tracks 1 threat exploiting it.
Last updated: 2026-02-13
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 v3 vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Weaknesses (CWE)
CWE-494
Exploitation status
CISA KEV-listed (known exploited)
Threats tracking this CVE
- Lotus Blossom APT Supply Chain Compromise of Notepad++ Update Infrastructure (CVE-2025-15556) — CRITICAL
References
- https://community.notepad-plus-plus.org/topic/27298/notepad-v8-8-9-vulnerability-fix
- https://github.com/notepad-plus-plus/notepad-plus-plus/commit/bcf2aa68ef414338d717e20e059459570ed6c5ab
- https://github.com/notepad-plus-plus/wingup/commit/ce0037549995ed0396cc363544d14b3425614fdb
- https://notepad-plus-plus.org/news/hijacked-incident-info-update/
- https://www.vulncheck.com/advisories/notepad-plus-plus-wingup-updater-lacks-update-integrity-verification
- https://notepad-plus-plus.org//news//clarification-security-incident/
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-15556
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Enriched from CVE.org, NVD (this product uses the NVD API but is not endorsed or certified by the NVD), FIRST EPSS, CISA KEV, and GitHub Security Advisories.