March 18, 2026 · Applied Cybernetics Group
CVE-2026-20963 — Microsoft SharePoint
Microsoft SharePoint Deserialization of Untrusted Data Vulnerability
- Added to KEV
2026-03-18- Federal due date
2026-03-21- Vendor
- Microsoft
- Product
- SharePoint
- EPSS
- 90.2th percentile (score 0.053, as of
2026-06-08) - NVD CVSS v3.1
- —
- Ransomware use
- Unknown
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2026-20963
CISA short description
Microsoft SharePoint contains a deserialization of untrusted data vulnerability that allows an unauthorized attacker to execute code over a network.
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.