CVE-2026-20963—Microsoft SharePoint Deserialization of Untrusted Data Vulnerability

PUBLISHEDvulnerability record
2026-03-18 · last modified March 19, 2026

Metadata

CVE ID:
CVE-2026-20963
Project:
Microsoft
Product:
SharePoint
Date Added:
2026-03-18
Due Date:
2026-03-21
Last Updated:
March 19, 2026

Vulnerability Name

Microsoft SharePoint Deserialization of Untrusted Data Vulnerability

Description

Microsoft SharePoint contains a deserialization of untrusted data vulnerability that allows an unauthorized attacker to execute code over a network.

Known To Be Used in Ransomware Campaigns?

Ransomware Status:
Unknown

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.

Additional Notes

  • https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20963
  • https://nvd.nist.gov/vuln/detail/CVE-2026-20963

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