Notepad++ Download of Code Without Integrity Check Vulnerability (CVE-2025-15556)
Severity: high · Patch status: patched · Since 2026-02-12 · CVE-2025-15556
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. CISA added CVE-2025-15556 to its Known Exploited Vulnerabilities catalog on Feb 12, 2026, which means attackers are exploiting it in the wild.
What to do
- Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- US federal agencies must remediate by Mar 5, 2026 (BOD 22-01); treat that as the outer limit.
Sources
All live incidents on Threat Watch
