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

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?

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

Related News Articles

Critical Microsoft SharePoint flaw now exploited in attacksMarch 19, 2026