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State-Sponsored Hackers Compromise Notepad++ Update Mechanism

State-Sponsored Hackers Compromise Notepad++ Update Mechanism

First seen 2 Feb 2026, 11:06 UTC • •

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ThreatCluster AI
ThreatCluster •March 12, 2026 at 13:27 UTC

Notepad++ has been hijacked by state-sponsored hackers, specifically a likely Chinese threat actor. The attackers compromised the software's update mechanism between June and December 2025, allowing them to redirect users to malicious servers by exploiting a flaw in update package validation.

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