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CVE-2025-15556

7.5 · HIGH Actively Exploited
Published Feb 3, 2026 notepad-plus-plus CWE-494

Overview

CVE-2025-15556 is a high-severity vulnerability affecting notepad-plus-plus notepad\+\+. It was published on February 3, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from notepad-plus-plus. Update notepad\+\+ to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

Vendor Product Versions Status
notepad-plus-plus notepad\+\+ >= 0, < 8.8.9 Affected

References

Ref community.notepad-plus-plus.org/topic/27298/notepad-v8-8-9-vulnerability-fix GitHub github.com/notepad-plus-plus/notepad-plus-plus/commit/bcf2aa68ef414338d717e20e059459570ed6c5ab GitHub github.com/notepad-plus-plus/wingup/commit/ce0037549995ed0396cc363544d14b3425614fdb Ref notepad-plus-plus.org/news/hijacked-incident-info-update/ Ref www.vulncheck.com/advisories/notepad-plus-plus-wingup-updater-lacks-update-integrity-verification Ref notepad-plus-plus.org//news//clarification-security-incident/ CISA www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-15556

Frequently Asked Questions

What is CVE-2025-15556?

CVE-2025-15556 is a high-severity vulnerability affecting notepad-plus-plus notepad\+\+. It was published on February 3, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

How severe is CVE-2025-15556?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-15556?

Check the references section for vendor advisories and patches from notepad-plus-plus. Update notepad\+\+ to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-15556?

CyberStrike's AI-powered security agents can automatically detect CVE-2025-15556 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.

How CyberStrike Helps

Autonomous Discovery

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Continuous Pentesting

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Code Review

AI-driven PR review catches vulnerable dependencies before they ship.
HackBrowser

Browser-based exploitation validates findings with real proof-of-concept.
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