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CVE-2026-20963Microsoft SharePoint Remote Code Execution Vulnerability
Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
9.8 CRITICALEPSS 29.20%⚡ Known Exploited (CISA KEV)NVD: Analyzed
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 9.8 | CRITICAL | 3.1microsoft (CNA) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| 9.8 | CRITICAL | 3.1microsoft (CNA) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C |
CISA required action
⚡ Known exploited · remediation due Mar 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.
Details
- CVE ID
- CVE-2026-20963
- Status
- Analyzed
- Assigner (CNA)
- microsoft
- Published
- Jan 13, 2026
- Last modified
- 2026-07-30 20:47 UTC
- Weaknesses
- CWE-502 · Deserialization of Untrusted Data
Affected Products
As published by the CNA in the CVE record.
MicrosoftMicrosoft SharePoint Enterprise Server 20161 version range
- 16.0.0 before 16.0.5535.1001
MicrosoftMicrosoft SharePoint Server 20191 version range
- 16.0.0 before 16.0.10417.20083
MicrosoftMicrosoft SharePoint Server Subscription Edition1 version range
- 16.0.0 before 16.0.19127.20442