# CVE-2025-15556

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.

- Page: https://www.vulneraibility.com/cve/CVE-2025-15556
- CVSS: 7.5
- Known exploited: yes, in CISA KEV since 2026-02-12; CISA due date 2026-03-05
- EPSS: 1.75%
- Unvetted proof-of-concept code on GitHub: 2 GitHub proofs of concept (first 2026-02-09)
- CISA SSVC: exploitation active, automatable no, technical impact total (assessed 2026-02-13)
- Weakness: CWE-494
- Published: 2026-02-03

## Affected versions

- notepad-plus-plus: affected < 8.8.9

A version outside these ranges is not a statement that it is unaffected.

## References

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

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.