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Backdoor in Notepad++

ID: 04b167de-b1e3-55e8-be4d-5fd2df47ab3a

STIX ID: report--04b167de-b1e3-55e8-be4d-5fd2df47ab3a

Feed Name: Schneier on Security

Threat Score
88/100

Date Published: 2026-02-05

Date Updated: 2026-04-19

Author: Bruce Schneier

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Hackers linked to the Chinese government trojanized the Notepad++ update infrastructure to deliver a backdoor to selected users by exploiting insufficient update verification; the attacker maintained access to internal services and redirected update traffic until December 2—users are advised to run at least version 8.9.1.

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