CVE-2025-15556

CVE Enrichment

CVSS: 7.7 HIGH
EPSS: 1.75%
EPSS Percentile: 77.97%
CISA KEV: YES — Known Exploited Vulnerability

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.

Technical Details

CVSS Version: 4.0
CNA / NVD Source: [email protected]
Published: 03-Feb-2026 08:15
Last Modified: 17-Jun-2026 15:38
EPSS Date: 2026-11-09
CWE: CWE-494

CVSS Vector


            CVSS:4.0                            AV:N /
                            AC:H /
                            AT:N /
                            PR:N /
                            UI:P /
                            VC:H /
                            VI:H /
                            VA:H /
                            SC:N /
                            SI:N /
                            SA:N /
                            E:X /
                            CR:X /
                            IR:X /
                            AR:X /
                            MAV:X /
                            MAC:X /
                            MAT:X /
                            MPR:X /
                            MUI:X /
                            MVC:X /
                            MVI:X /
                            MVA:X /
                            MSC:X /
                            MSI:X /
                            MSA:X /
                            S:X /
                            AU:X /
                            R:X /
                            V:X /
                            RE:X /
                            U:X

CISA KEV Details

Date Added: 2026-02-12
Remediation Due: 2026-03-05
Known Ransomware Campaign Use: Unknown
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.
Notes: https://notepad-plus-plus.org/news/clarification-security-incident/ ; https://community.notepad-plus-plus.org/topic/27298/notepad-v8-8-9-vulnerability-fix ; https://nvd.nist.gov/vuln/detail/CVE-2025-15556

CNA Products / Version Status

notepad-plus-plus · notepad-plus-plus Source: CNA · [email protected]
Default status: unaffected

0 ≤ version < 8.8.9 — affected (semver)

repo: https://github.com/notepad-plus-plus

Affected Products / Versions

notepad-plus-plus / notepad\+\+ Source: NVD CPE · affected
Version / affected range: * · before (exclusive) 8.8.9
cpe:2.3:a:notepad-plus-plus:notepad\+\+:*:*:*:*:*:*:*:*

References

Last enrichment sync: 10-Nov-2026 20:49
Sources: NVD · FIRST EPSS · CISA KEV
Latest successful provider update; providers refresh independently.

Reported Context (1)

[CVE ] Exploited vulnerabilities used as initial access vectors – CVE-2025-15556, CVE-2012-0158, and 7 more CVEs (e.g., CVE-2018-0802, CVE-2017-11882). Lotus Blossom Profile Traces Shift From Phishing to Supply-Chain Espionage

CVE (9)

Malware (5)

Threat Actors (5)

MITRE ATT&CK (15)

Vendors (2)

Products (6)

Tools (7)

Industries (5)

Countries (10)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.