CSIRTS // UNIFIED SECURITY ADVISORY FEEDSYS ● ONLINE · POWERED BY INTELFUSIONS.COM

← Back to feed

CVE-2025-15556: Notepad++ Download of Code Without Integrity Check Vulnerability

criticalknown exploitedpublic exploitCVE-2025-15556
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.

CSIRTS triage

vendor: Notepad++product: Notepad++Supply chain
What
Notepad++ contains a download of code without integrity check vulnerability.
Who is affected
Users of Notepad++ using the WinGUp updater.
Urgency
Remediation is urgent due to active exploitation and critical severity.
Action
Update Notepad++ to the latest version.

AI-assisted analysis generated from the source advisory — verify against the original.

⚡ Watch Notepad++

Get an email when a new Notepad++ advisory drops — max one per day, one-click unsubscribe.

Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2026-02-12
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2025-15556

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2025-15556coverage & exploitation statusNVD · CVE.org

More from CISA Known Exploited Vulnerabilities