CISA Warns of Critical Code Execution Flaw in Notepad++, Hackers Actively Exploiting Vulnerability

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CISA Warns of Critical Code Execution Flaw in Notepad++, Hackers Actively Exploiting Vulnerability

The420.In • February 14, 2026

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CISA flags active exploitation of Notepad++ RCE flaw (CVE-2025-15556); federal agencies must patch by March 5.

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

CISA Alerts on Active Exploitation of Notepad++ RCE Flaw CVE-2025-15556 CISA has identified a critical remote code execution vulnerability (CVE-2025-15556) in Notepad++, which is actively being exploited. Federal agencies are required to apply patches by March 5, 2026, following its addition to the Known Exploited Vulnerabilities catalog on February 12, 2026. 2 sources 57

Extracted Entities

Attack Types (1)

Zero-day Exploit

CVEs (1)

MITRE ATT&CK (1)

T1203 - Exploitation for Client Execution