MSRXCVE-2025-15556
CVE-2025-15556
Notepad++ < 8.8.9 WinGUp Updater Lacks Update Integrity Verification
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CVSS 4.0 · CNA
chance of exploitation in the next 30 days (EPSS; higher than 78% of CVEs)
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: < 8.8.9
Weakness: CWE-494
5 references (advisories, patches, write-ups)
- 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
Sources: CVE.org, OSV.dev, FIRST EPSS. Missing ones did not answer or have no record yet.