Vulnerability in Notepad-Plus-Plus Notepad\+\+
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.018 (77.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 77.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.017 · newest: 0.018 · change: +0.001
Affected products
- Notepad-Plus-Plus Notepad\+\+
- Notepad-Plus-Plus — versions 0
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Public proof-of-concept exploits
References
- community.notepad-plus-plus.org/topic/27298/notepad-v8-8-9-vulnerability-fix (release-notes, Release Notes, patch)
- notepad-plus-plus.org/news/hijacked-incident-info-update/ (vendor-advisory, Patch, Vendor Advisory)
- github.com/notepad-plus-plus/notepad-plus-plus/commit/bcf2aa68ef414338d717e20e0… (Patch, patch)
- github.com/notepad-plus-plus/wingup/commit/ce0037549995ed0396cc363544d14b342561… (Patch, patch)
- www.vulncheck.com/advisories/notepad-plus-plus-wingup-updater-lacks-update-inte… (Third Party Advisory, third-party-advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Vendor Advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)
Frequently asked questions
- What is CVE-2025-15556?
- CVE-2025-15556 is a high-severity vulnerability in Notepad-Plus-Plus Notepad\+\+, classified under Download of Code Without Integrity Check. CVSS score: 7.5/10. Published 2026-02-03.
- How severe is CVE-2025-15556?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2025-15556 known to be exploited?
- Yes. CVE-2025-15556 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-02-12), indicating it is being actively exploited. 2 public proof-of-concept repositories are indexed.