CVE-2025-15556: notepad-plus-plus notepad-plus-plus

Notepad++ < 8.8.9 WinGUp Updater Lacks Update Integrity Verification

CVSS 7.7 HighCriticalIn CISA KEVEPSS 0.017 · 77th percentile

Critical, because:

In CISA’s KEV catalogue since 12 Feb 2026: it is known to be exploited.

Published by the CVE Program (CNA: VulnCheck) at 3 Feb 2026, 00:50 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
notepad-plus-plus	notepad-plus-plus	affected before 8.8.9 semver Other versions: unaffected

Identifiers

CVE-2025-15556

CNA

VulnCheck

Weakness (CWE)

CWE-494

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
7.7	High	4.0	CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	CNA (VulnCheck)

CISA KEV Listed since 12 Feb 2026: known to be exploited.
EPSS 0.017, the 77th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 3 Feb 2026. New records show when each source confirmed them.

Sources

References from the CNA

community.notepad-plus-plus.org/topic/27298/notepad-v8-8-9-vulnerability-fix release-notespatch
notepad-plus-plus.org/news/hijacked-incident-info-update/ vendor-advisory
github.com/notepad-plus-plus/notepad-plus-plus/commit/bcf2aa68ef414338d717e20e059459570ed6c5ab patch
github.com/notepad-plus-plus/wingup/commit/ce0037549995ed0396cc363544d14b3425614fdb patch
www.vulncheck.com/advisories/notepad-plus-plus-wingup-updater-lacks-update-integrity-verification third-party-advisory

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.