CVE-2026-20963

9.8 criticalKEVEPSS 29%

Critical (9.8) in Microsoft SharePoint. In CISA KEV since 2026-03-18. EPSS 29% chance of exploitation in the next 30 days.

Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.

Severity

9.8 critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 29% chance of exploitation in the next 30 days; higher than 98% of CVEs (scores of 2026-10-31)
CISA KEV: listed 2026-03-18, due 2026-03-21
CWE: CWE-502
Published: 2026-01-13
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19