HIGH CISA KEV

CVE-2025-15556

CVSS v3

7.5

HIGH

EPSS Score

1.8 %

exploit probability, as of 2026-10-03

CISA KEV

Yes

known exploited

Exploitation

—

SSVC status

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.

CISA Known Exploited Vulnerability

Date Added: 2026-02-12
Patch Due Date: 2026-03-05
Ransomware Use: Unknown

Technical details

Published: 2026-02-03
Last Modified: 2026-02-13

Frequently asked questions

What is CVE-2025-15556?

Is CVE-2025-15556 actively exploited?

Yes. CVE-2025-15556 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2026-03-05.

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

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

Is CVE-2025-15556 affecting your environment?

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