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CVE-2025-15556— Notepad++ < 8.8.9 WinGUp Updater Lacks Update Integrity Verification

Quick assessment

Affected
notepad-plus-plus notepad-plus-plus
Exploitation
Confirmed exploitation in the wild; remediate immediately
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Notepad++是中国台湾侯今吾（Don Ho）个人开发者的一款开源的纯文本编辑器。 Notepad++ 8.8.9之前版本存在安全漏洞，该漏洞源于使用WinGUp更新器时更新完整性验证不足，可能导致执行任意代码。

AI Predicted 8.8 Difficulty: Easy KEV EPSS 1.77% · P77

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-15556

Vulnerability Information
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Vulnerability Title
Notepad++ < 8.8.9 WinGUp Updater Lacks Update Integrity Verification
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
下载代码缺少完整性检查
Source: CVE Program / CVE List V5
Vulnerability Title
Notepad++ 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Notepad++是中国台湾侯今吾（Don Ho）个人开发者的一款开源的纯文本编辑器。 Notepad++ 8.8.9之前版本存在安全漏洞，该漏洞源于使用WinGUp更新器时更新完整性验证不足，可能导致执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Shenlong Deep Dive — AI Deep Analysis

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Affected Products

Vendor Product Affected Versions CPE Subscribe
notepad-plus-plus notepad-plus-plus 0 ~ 8.8.9 -

II. Public POCs for CVE-2025-15556

# POC Description Source Link Shenlong Link
1 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. https://github.com/renat0z3r0/notepadpp-supply-chain-iocs POC Details
2 None https://github.com/George0Papasotiriou/CVE-2025-15556-Notepad-WinGUp-Updater-RCE POC Details
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III. Intelligence Information for CVE-2025-15556

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Patches & Fixes for CVE-2025-15556 (2)

IV. Related Vulnerabilities

Same product: notepad-plus-plus
Same vendor: notepad-plus-plus
Same weakness: CWE-494

V. Comments for CVE-2025-15556

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