CVE-2025-15556

CISA description

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.

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 & references

• 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

Where this lands in 800-53

Vulnerability data triggers these controls during assessment and continuous monitoring.

• RA-5 · Vulnerability Monitoring and Scanning
• SI-2 · Flaw Remediation
• CM-6 · Configuration Settings
• SI-7 · Software, Firmware, and Information Integrity
• CM-8 · System Component Inventory

External lookups

• NVD · CVE-2025-15556
• CVE.org · CVE-2025-15556
• CISA KEV catalog (canonical)