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CVE-2026-20963
CRITICALCISA KEV9.8
Description
Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
CVE Details
CVSS v3.1 Score9.8
SeverityCRITICAL
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack VectorNETWORK
ComplexityLOW
Privileges RequiredNONE
User InteractionNONE
Published1/13/2026
Last Modified4/1/2026
Sourcekev
Honeypot Sightings0
CISA KEV
VendorMicrosoft
ProductSharePoint
Vulnerability NameMicrosoft SharePoint Deserialization of Untrusted Data Vulnerability
KEV Date Added2026-03-18
Remediation Due Date2026-03-21
Ransomware UseUnknown
Affected Products
microsoft:sharepoint_server
Weaknesses (CWE)
CWE-502
References
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20963(secure@microsoft.com)
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20963(134c704f-9b21-4f2e-91b3-4a467353bcc0)
IOC Correlations
No correlations recorded
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