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CVE-2026-20963

Microsoft SharePoint Deserialization of Untrusted Data Vulnerability

Microsoft SharePoint

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

CVSS Score
Unrated
EPSS — Exploit Probability
32%
Riskier than 98% of all CVEs · checked 2026-09-04
Exploitation
Confirmed in the wild
KEV since 2026-03-18
Remediation
Unconfirmed
Federal deadline 2026-03-21
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. Deadline for federal agencies: 2026-03-21.

NVD entry CISA KEV

5 articles across 5 outlets · first covered Mar 18, 2026 · latest Mar 19, 2026

Coverage timeline

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