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CWE

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CVE-2025-15556

Published: Feb 3, 2026

Modified: Mar 5, 2026

PUBLISHED

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.

Vendor	Product	Versions
notepad-plus-plus	notepad-plus-plus	affected `0 - < 8.8.9`

Weaknesses (CWE)

References

https://community.notepad-plus-plus.org/topic/27298/notepad-v8-8-9-vulnerability-fix

release-notes

patch

https://notepad-plus-plus.org/news/hijacked-incident-info-update/

vendor-advisory

https://github.com/notepad-plus-plus/notepad-plus-plus/commit/bcf2aa68ef414338d717e20e059459570ed6c5ab

patch

https://github.com/notepad-plus-plus/wingup/commit/ce0037549995ed0396cc363544d14b3425614fdb

patch

https://www.vulncheck.com/advisories/notepad-plus-plus-wingup-updater-lacks-update-integrity-verification

third-party-advisory

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