# CVE-2025-15556: Notepad++ < 8.8.9 WinGUp Updater Lacks Update Integrity Verification

> CVE-2025-15556: Notepad++ < 8.8.9 WinGUp Updater Lacks Update Integrity Verification. CVSS 7.5 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2025-15556
Last updated: 2026-06-17T08:38:01Z

- Published: 2026-02-03 00:50 UTC · Updated: 2026-06-17 08:38 UTC · Assigner: VulnCheck
- CVSS: 7.5 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS: 1.8%, 78th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2026-02-12, federal due date 2026-03-05, ransomware use: Unknown
- CWE: CWE-494

## 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.

## CISA required action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

## Affected vendors and products

- notepad-plus-plus: notepad-plus-plus

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2025-15556)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2025-15556)
- [https://community.notepad-plus-plus.org/topic/27298/notepad-v8-8-9-vulnerability-fix](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/notepad-plus-plus/commit/bcf2aa68ef414338d717e20e059459570ed6c5ab)
- [https://github.com/notepad-plus-plus/wingup/commit/ce0037549995ed0396cc363544d14b3425614fdb](https://github.com/notepad-plus-plus/wingup/commit/ce0037549995ed0396cc363544d14b3425614fdb)
- [https://notepad-plus-plus.org/news/hijacked-incident-info-update/](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://www.vulncheck.com/advisories/notepad-plus-plus-wingup-updater-lacks-update-integrity-verification)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2025-15556 · Markdown: https://rewindex.com/cve/CVE-2025-15556.md · JSON: https://rewindex.com/api/v1/cves/CVE-2025-15556 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T04:06:11.210Z