In late December 2025, EmEditor, a highly extensible and widely used text, code, and CSV editor developed by U.S.-based Emurasoft, published a security advisory warning users that its download page had been compromised. The attackers’ objective was to distribute a compromised version of the program to unsuspecting users.
EmEditor has longstanding recognition within Japanese developer communities as a recommended Windows-based editor. This suggests that the attackers are targeting this specific user base, or that they have a particular target among EmEditor users and used the compromised download page as delivery mechanism.
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Source: Trend Micro
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