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CISA Warns of Notepad++ Code Execution Vulnerability Exploited in Attacks

## Notepad++ Code Execution Vulnerability: Critical Update

NBy Natalie RhodesFeb 13, 20261 min read

Notepad++ Code Execution Vulnerability: Critical Update

The Cybersecurity and Infrastructure Security Agency (CISA) has added CVE-2025-15556 to its Known Exploited Vulnerabilities catalog. This inclusion highlights the active exploitation of a critical code execution vulnerability in Notepad++, a widely used open-source text editor.

On February 12, 2026, CISA detailed the vulnerability, with a federal civilian executive branch patching deadline set for March 5, 2026. The flaw arises from the WinGUp updater's failure to verify the integrity of downloaded code.

Attackers can intercept or redirect update traffic, potentially installing malicious payloads that execute arbitrary code with user-level privileges. This vulnerability, categorized under CWE-494, poses significant risks, particularly through man-in-the-middle (MitM) attacks on unsecured networks.

The vulnerability allows attackers to serve tampered installers, which could deploy ransomware, malware droppers, or persistent backdoors. Notepad++'s widespread use on Windows platforms increases the risk, especially in enterprises where manual updates are standard practice.

The Cybersecurity and Infrastructure Security Agency (CISA) has added CVE-2025-15556 to its Known Exploited Vulnerabilities catalog.
Natalie Rhodes · Thehackingpost

Notepad++ developers have addressed the issue in version 8.8.9 and later. The patch includes cryptographic verification of update packages, preventing interception attempts. Users of vulnerable versions, primarily 8.6 through 8.8.8, remain at risk if auto-updates are disabled.

Immediately apply vendor patches as advised by CISA. Adhere to Binding Operational Directive 22-01 for cloud-integrated services or discontinue use if mitigations are not feasible. Scan endpoints for outdated Notepad++ installations using tools like Microsoft Defender. Disable WinGUp temporarily and enforce network segmentation to block MitM vectors. Enable update notifications and verify downloads against official SHA-256 hashes from the Notepad++ website .

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Organizations are urged to take immediate action to secure their systems against this vulnerability, ensuring the integrity and security of their software environments.

Based on reporting by Cyber Security News.

AI transparency. This article was produced with the assistance of artificial intelligence and published under human editorial oversight. AI systems can make mistakes. Read how we use AI (EU AI Act, Art. 50).
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