CVE-2026-21509: APT28 Exploits Microsoft Office Zero-day Vulnerability
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On January 26, 2026, Microsoft disclosed a critical zero-day vulnerability in its Office products, tracked as CVE-2026-21509. This vulnerability allows attackers to execute malicious code remotely, leading to full system compromise. The vulnerability was leveraged by APT28, a notorious Russia-linked threat group, as part of a wider cyberattack campaign known as Operation Neusploit. With APT28's history of targeting government organizations and critical infrastructure, CVE-2026-21509 has raised serious concerns regarding the security of sensitive systems, especially in Ukraine and Eastern Europe.
Article Link: CVE-2026-21509: APT28 Exploits Microsoft Office Zero-day Vulnerability
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