🚨 Microsoft Office 0-day Exploited by APT28 Hacker Group to Deploy Malware
Source: https://t.co/JGHkAyZ3OR
The Russia-linked threat group UAC-0001, also known as APT28, has been actively exploiting a critical zero-day vulnerability in Microsoft Office.
The group is using this flaw to deploy sophisticated malware against Ukrainian government entities and European Union organizations.
The vulnerability, identified as CVE-2026-21509, was disclosed by Microsoft on January 26, 2026, with warnings about active exploitation in the wild. Within 24 hours of Microsoft’s public disclosure, threat actors had already weaponized the vulnerability.
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