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High · 8.8 Known exploited · Ransomware Public exploit CVE-2026-45659 EUVD-2026-31518GHSA-w3mh-jmwv-56f3

Microsoft SharePoint Remote Code Execution Vulnerability

Published May 22, 2026 · Updated Aug 11, 2026 · Assigned by microsoft

Vendor: Microsoft Product: Microsoft SharePoint Enterprise Server 2016 Product: Microsoft SharePoint Server 2019 Product: Microsoft SharePoint Server Subscription Edition

Description

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

Affected products

VendorProductAffectedFixed
Microsoft Microsoft SharePoint Enterprise Server 2016 16.0.0 – < 16.0.5552.1002 16.0.5552.1002
Microsoft Microsoft SharePoint Server 2019 16.0.0 – < 16.0.10417.20128 16.0.10417.20128
Microsoft Microsoft SharePoint Server Subscription Edition 16.0.0 – < 16.0.19725.20280 16.0.19725.20280

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Advisories 2

References