Actively exploited in the wild
Microsoft SharePoint Deserialization of Untrusted Data Vulnerability
Microsoft - SharePoint · Listed in the CISA KEV since 2026-03-18. This indicates confirmed attacks in production environments.
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CVE-2026-20963
CriticalCVSS 9.8KEVSummary
Deserializacja nieufnych danych w Microsoft Office SharePoint umożliwia nieautoryzowanemu atakującemu wykonanie kodu w sieci.
Risk Assessment
Atakujący może wykorzystać tę podatność do zdalnego wykonania kodu, co może prowadzić do przejęcia kontroli nad systemem lub wycieku danych.
Recommendation
Zaleca się aktualizację Microsoft Office SharePoint do najnowszej wersji oraz wdrożenie odpowiednich zabezpieczeń, aby zminimalizować ryzyko ataku.
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Original NVD description (English source)
Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

