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CVE-2026-45659Microsoft SharePoint Remote Code Execution Vulnerability
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
8.8 HIGHEPSS 80.24%⚡ Known Exploited (CISA KEV)NVD: Analyzed
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 8.8 | HIGH | 3.1microsoft (CNA) | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 8.8 | HIGH | 3.1microsoft (CNA) | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C |
CISA required action
⚡ Known exploited · remediation due Jul 4, 2026
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Details
- CVE ID
- CVE-2026-45659
- Status
- Analyzed
- Assigner (CNA)
- microsoft
- Published
- May 22, 2026
- Last modified
- 2026-08-11 03:55 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 16.0.5552.1002
MicrosoftMicrosoft SharePoint Server 20191 version range
- 16.0.0 before 16.0.10417.20128
MicrosoftMicrosoft SharePoint Server Subscription Edition1 version range
- 16.0.0 before 16.0.19725.20280