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Vulnerabilities CVE-2026-45659

CVE-2026-45659

High
Open
KEV
TLP:CLEAR

Microsoft SharePoint Remote Code Execution Vulnerability

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Description

Microsoft — SharePoint Server — Microsoft SharePoint Server contains a deserialization of untrusted data vulnerability which allows an authorized attacker to execute code over a network.

Details

CVSS Score
8.8
EPSS Score
9.12%

94.8th percentile

CVSS Vector
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
Confidence
100%
Published
May 22, 2026
Last Modified
Aug 11, 2026
CISA KEV
Date Added
Jul 1, 2026
Patch Due
Jul 4, 2026
Used in ransomware campaigns
Required Action
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.
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