Is CVE-2025-15556 in the CISA KEV catalog?

Yes. CVE-2025-15556 is on the CISA Known Exploited Vulnerabilities list, added 2026-02-12.

What is the CVSS severity of CVE-2025-15556?

CVE-2025-15556 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2025-15556?

CVE-2025-15556 has an EPSS score of 1.27% (67th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-15556?

Upgrade notepad\+\+ to 8.8.9 or later.

CVE & CISA-KEV Catalog

CVE-2025-15556

HIGHCISA KEV

7.5

CVSS v3

NVD

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.

CWE-494

How to fix

Remediation Available

notepad\+\+NVD

Affected:< 8.8.9Fixed in:8.8.9CVE-2025-15556derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploit Intelligence

1.27%probability of exploitation in 30 days

67thpercentile

Moderate risk: more likely to be exploited than 67% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Remediation due: 2026-03-05

References

Patch3

Vendor Advisory1

notepad-plus-plus.org

Third-Party Advisory1

vulncheck.com

Government Resource1

cisa.gov

Release Notes1

community.notepad-plus-plus.org

Related Vulnerabilities

Other CWE-494 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-5398	High	7.5	88%	-	Fix
CVE-2022-40799	High	8.8	31%	KEV	-
CVE-2026-3502	High	7.8	5.8%	KEV	Fix
CVE-2018-19234	High	8.8	3.3%	-	Fix
CVE-2016-6567	Critical	9.8	2.9%	-	-
CVE-2016-6564	High	8.1	2.7%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-02-13.