CVE-2025-15556
Notepad++ Download of Code Without Integrity Check Vulnerability - [Actively Exploited]
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.
INFO
Published Date :
Feb. 3, 2026, 1:15 a.m.
Last Modified :
Feb. 13, 2026, 2:03 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CISA KEV (Known Exploited Vulnerabilities)
For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.
Notepad++ when using the WinGUp updater, contains a download of code without integrity check vulnerability that could allow an attacker to intercept or redirect update traffic to download and execute an attacker-controlled installer. This could lead to arbitrary code execution with the privileges of the user.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Unknown
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
Affected Products
The following products are affected by CVE-2025-15556
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update Notepad++ to version 8.8.9 or later.
- Verify update integrity using cryptographic methods.
Public PoC/Exploit Available at Github
CVE-2025-15556 has a 5 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-15556.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-15556 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-15556
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Cross-platform CLI tool for monitoring NVD CVE database
Makefile Python Shell
None
Python Shell
IoCs and detection rules for the Notepad++ supply chain attack (CVE-2025-15556) — Lotus Blossom APT, June–December 2025. Includes Falcon LogScale queries, YARA/Sigma rules, and MITRE ATT&CK mapping.
cve-2025-15556 threat-hunting threat-intelligence notepad-plus-plus supply-chain-attack
PowerShell-based, read-only IoC scanner for the Notepad++ 2025 supply-chain compromise (Chrysalis / Lotus Blossom). Detects file hashes, persistence (services/Run keys/tasks), mutex, DNS/network indicators, and exports JSON/CSV for IR.
PowerShell
📡 PoC auto collect from GitHub. ⚠️ Be careful Malware.
security cve exploit poc vulnerability
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-15556 vulnerability anywhere in the article.
-
TheCyberThrone
CISA KEV Catalog Update Feb 12 2026
February 13, 2026On February 12, 2026, CISA added four new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog. The addition confirms active exploitation in the wild and triggers a re ... Read more
-
The Hacker News
Researchers Observe In-the-Wild Exploitation of BeyondTrust CVSS 9.9 Vulnerability
Threat actors have started to exploit a recently disclosed critical security flaw impacting BeyondTrust Remote Support (RS) and Privileged Remote Access (PRA) products, according to watchTowr. "Overni ... Read more
-
CybersecurityNews
Critical Vulnerability in Next-Mdx-Remote Allows Arbitrary Code Execution in React Server-Side Rendering
Vulnerability in Next-Mdx-Remote Security advisory HCSEC-2026-01 revealed a critical vulnerability in the next-mdx-remote library that allows attackers to execute arbitrary code on servers rendering u ... Read more
-
CybersecurityNews
CISA Warns of Notepad++ Code Execution Vulnerability Exploited in Attacks
Notepad++ Code Execution Vulnerability CISA has added CVE-2025-15556 to its Known Exploited Vulnerabilities (KEV) catalog, highlighting active exploitation of a critical code execution flaw in Notepad ... Read more
The following table lists the changes that have been made to the
CVE-2025-15556 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Feb. 13, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Added CPE Configuration OR *cpe:2.3:a:notepad-plus-plus:notepad++:*:*:*:*:*:*:*:* versions up to (excluding) 8.8.9 Added Reference Type VulnCheck: https://community.notepad-plus-plus.org/topic/27298/notepad-v8-8-9-vulnerability-fix Types: Release Notes Added Reference Type VulnCheck: https://github.com/notepad-plus-plus/notepad-plus-plus/commit/bcf2aa68ef414338d717e20e059459570ed6c5ab Types: Patch Added Reference Type VulnCheck: https://github.com/notepad-plus-plus/wingup/commit/ce0037549995ed0396cc363544d14b3425614fdb Types: Patch Added Reference Type CISA-ADP: https://notepad-plus-plus.org//news//clarification-security-incident/ Types: Vendor Advisory Added Reference Type VulnCheck: https://notepad-plus-plus.org/news/hijacked-incident-info-update/ Types: Patch, Vendor Advisory Added Reference Type CISA-ADP: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-15556 Types: US Government Resource Added Reference Type VulnCheck: https://www.vulncheck.com/advisories/notepad-plus-plus-wingup-updater-lacks-update-integrity-verification Types: Third Party Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Feb. 12, 2026
Action Type Old Value New Value Added Reference https://notepad-plus-plus.org//news//clarification-security-incident/ Added Reference https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-15556 -
New CVE Received by [email protected]
Feb. 03, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 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 Added CWE CWE-494 Added Reference https://community.notepad-plus-plus.org/topic/27298/notepad-v8-8-9-vulnerability-fix Added Reference https://github.com/notepad-plus-plus/notepad-plus-plus/commit/bcf2aa68ef414338d717e20e059459570ed6c5ab Added Reference https://github.com/notepad-plus-plus/wingup/commit/ce0037549995ed0396cc363544d14b3425614fdb Added Reference https://notepad-plus-plus.org/news/hijacked-incident-info-update/ Added Reference https://www.vulncheck.com/advisories/notepad-plus-plus-wingup-updater-lacks-update-integrity-verification