APT28 Tied to CVE-2026-21513 MSHTML 0-Day Exploited Before Feb 2026 Patch Tuesday

APT28 exploited CVE-2026-21513, an MSHTML zero-day (CVSS 8.8), using malicious LNK files to bypass security controls and execute code.

Part of the PlainSec briefing for 2026-03-07

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