CVE-2026-20963

high-risk
Published 2026-01-13

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

Do I need to act?

~
6.0% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
!
CISA KEV: actively exploited in the wild
On the Known Exploited Vulnerabilities catalog — federal agencies must patch
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
9
CVSS 9.8/10 Critical
NETWORK / LOW complexity

Affected Products (3)

Affected Vendors

Microsoft

References (2)

Vendor Advisory https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20963
US Government Resource https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-...
57
/ 100
high-risk
Severity 32/34 · Critical
Exploitability 16/34 · Moderate
Exposure 9/34 · Low