CVE-2025-15556
CVSS v3
7.5
HIGH
EPSS Score
6.1 %
exploit probability
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
- CVSS v3 Vector
- 3.1
- Published
- 2026-02-03
- Last Modified
- 2026-02-13
Frequently asked questions
What is CVE-2025-15556?
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.
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 3/5/2026.
What is the CVSS score for CVE-2025-15556?
CVE-2025-15556 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string 3.1.
Is CVE-2025-15556 affecting your environment?
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