Jan 2026: Microsoft SharePoint Remote Code Execution Vulnerability
CVE-2026-20963 Published on January 13, 2026
Microsoft SharePoint Remote Code Execution Vulnerability
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
Known Exploited Vulnerability
This Microsoft SharePoint Deserialization of Untrusted Data Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. Microsoft SharePoint contains a deserialization of untrusted data vulnerability that allows an unauthorized attacker to execute code over a network.
The following remediation steps are recommended / required by March 21, 2026: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Weakness Type
What is a Marshaling, Unmarshaling Vulnerability?
The application deserializes untrusted data without sufficiently verifying that the resulting data will be valid.
CVE-2026-20963 has been classified to as a Marshaling, Unmarshaling vulnerability or weakness.
Products Associated with CVE-2026-20963
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Affected Versions
Microsoft SharePoint Enterprise Server 2016:- Version 16.0.0 and below 16.0.5535.1001 is affected.
- Version 16.0.0 and below 16.0.10417.20083 is affected.
- Version 16.0.0 and below 16.0.19127.20442 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.