Tag: CVE-2026-21509
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Three-Day Turnaround: How APT28 Rapidly Weaponized the Latest Microsoft Office Zero-Day
The sophisticated threat actor APT28 has commenced the exploitation of a nascent Microsoft Office vulnerability almost immediately following its public disclosure. According to researchers, these incursions were initiated within a mere three-day window, primarily targeting entities across Ukraine, Slovakia, and Romania. Security analysts at Zscaler have designated this campaign Operation Neusploit, which centers upon CVE-2026-21509—a…
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Office Under Siege: Microsoft Rushes Emergency Fix for Active Zero-Day
Microsoft has issued an urgent, out-of-band security update for Microsoft Office to mitigate a high-stakes zero-day vulnerability that is currently being exploited in live environments. This flaw facilitates the circumvention of native security protocols and can be weaponized through a seemingly innocuous document, triggered merely by the act of opening the file. The vulnerability, designated…