Vulnerability Intelligence Report
Notepad++ < 8.8.9 WinGUp Updater Lacks Update Integrity Verification
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.
CISA KEV
SSVC: Active Exploitation
CVSS Base Score
7.7
HIGH
EPSS Probability:1.27%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
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Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-494 ↗CWE-494 Download of Code Without Integrity Check
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| notepad-plus-plus | notepad-plus-plus | 0 < 8.8.9 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | VulnCheck · Bug Bounty Provider · USA |
| Reserved | 2026-02-02T22:25:12 |
| Published | 2026-02-03T00:50:29 |
| Last Updated | 2026-03-05T01:29:51 |
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