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Threat Intelligence Report

APT28 Leverages CVE-2026-21509 in Operation Neusploit

๐Ÿ“… February 14, 2026 ๐Ÿ“ฐ www.zscaler.com ๐Ÿ” 1 CVE(s) referenced

APT28 exploited a zero-day Microsoft Office vulnerability (CVE-2026-21509) in a targeted campaign against Central and Eastern Europe, delivering advanced backdoors and email stealers through weaponized RTF files and sophisticated multi-stage infection chains.

vendor
CVE-2026-21509

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