Exploited vulnerabilities / CVE-2025-15556
Confirmed exploited · remote code execution · Notepad++CVE-2025-15556
Notepad++ remote code execution, confirmed exploited in the wild.
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's name for it | Notepad++ Download of Code Without Integrity Check Vulnerability |
|---|---|
| Vendor and product | Notepad++ · Notepad++ |
| Type | remote code execution · CWE-494 |
| Exploited | Confirmed by CISA listed 12 February 2026 |
| Likelihood | more likely to be exploited than most |
| Deadline | 5 March 2026 · already passed |
| Used in ransomware | Not reported |
| Advisories | notepad-plus-plus.org ↗ · community.notepad-plus-plus.org ↗ · nvd.nist.gov ↗ |
Three steps, in this order
Patch to the fixed version the vendor names, today if the product faces the internet.
Until it is patched, take the affected service off the internet or put it behind a VPN or allow-list.
Look for signs it was already used: new accounts, web shells, unexpected processes and outbound connections since the date it was listed.
| CISA's 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. |
|---|
Know before someone else finds it
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CVE-2025-15556 in short
Is CVE-2025-15556 being exploited?
Yes. CISA added CVE-2025-15556 to its Known Exploited Vulnerabilities catalogue on 12 February 2026, which it does only on evidence of exploitation in the wild.
What is the CISA deadline for CVE-2025-15556?
US federal agencies must remediate it by 5 March 2026. Everyone else should treat that date as the latest safe point to patch an internet-facing system.
How likely is CVE-2025-15556 to be exploited in the next 30 days?
FIRST's Exploit Prediction Scoring System gives it 1.7%, the 78th percentile of every CVE it scores.
How do I fix CVE-2025-15556?
Patch to the fixed version the vendor names, today if the product faces the internet. Until it is patched, take the affected service off the internet or put it behind a VPN or allow-list. Look for signs it was already used: new accounts, web shells, unexpected processes and outbound connections since the date it was listed.
Sources: CISA Known Exploited Vulnerabilities catalogue (released 10 November 2026) and FIRST EPSS. Page compiled automatically by SAK T.L.M, the threat-intelligence tool of SAK T.E.C, on 13 November 2026.