CVE-2026-20963

CWE-502 — Deserialization of Untrusted Data6 documents6 sources
9.8
CVSS
CRITICAL
EPSS6.0%(91th)
CISA KEV
CISA 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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HExploitability: 3.9 | Impact: 5.9

Affected Packages1 packages

▶NVDmicrosoft/sharepoint_server< 16.0.19127.20442+2
Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
NVD ↗MITRE ↗

🔴Vulnerability Details

2
CVEList
Microsoft SharePoint Remote Code Execution Vulnerability↗2026-01-13
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VulnCheck
Microsoft SharePoint Deserialization of Untrusted Data Vulnerability↗2026
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📋Vendor Advisories

2
CISA
Microsoft SharePoint Deserialization of Untrusted Data Vulnerability↗2026-03-18
▶
Microsoft
Microsoft SharePoint Remote Code Execution Vulnerability↗2026-03-10
▶

🕵️Threat Intelligence

1
Bleepingcomputer
Critical Microsoft SharePoint flaw now exploited in attacks↗2026-03-19
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