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CVE-2026-45659

HighPublished

Microsoft SharePoint Remote Code Execution Vulnerability

Published: May 22, 2026
Updated: Aug 11, 2026
Assigning CNA: microsoft
Evidence observed: Jul 1, 2026

Primary CVSS

8.8/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

76.1%

High · next 30 days

Percentile: 99.5%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

CISA Known Exploited

This CVE appears in the CISA Known Exploited Vulnerabilities catalog.

Summary

Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

Sources

sharepoint-deserialization-security-assessmentInformational
Professional vulnerability assessment report for SharePoint deserialization risk, including executive summary, technical impact, remediation, and mitigation strategy.
CVE-2026-45659Exploit
CVE-2026-45659
sharepoint-2026-pocPoC
PoC, IOCs, and detection logic for the SharePoint /_trust WS-Federation BinaryFormatter deserialization chain. Lab reconstruction covering unauthenticated RCE, in-process machine key theft, and the artifacts each variant leaves behind. SharePoint 2016, 2019, and Subscription Edition. CVE-2026-50522, CVE-2026-45659, CVE-2026-56164, CVE-2026-58644.

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