Description
Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Microsoft | Microsoft SharePoint Enterprise Server 2016 | 16.0.0 – < 16.0.5561.1001 | 16.0.5561.1001 |
| Microsoft | Microsoft SharePoint Server 2019 | 16.0.0 – < 16.0.10417.20175 | 16.0.10417.20175 |
| Microsoft | Microsoft SharePoint Server Subscription Edition | 16.0.0 – < 16.0.19725.20434 | 16.0.19725.20434 |
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
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sam00/POC-CVE-2026-56164-exploit ★ 2 · Aug 6, 2026
CVE-2026-56164 is a critical missing-authentication vulnerability affecting on-premises Microsoft SharePoint Server. It allows unauthenticated, remote attackers to elevate privileges over a network.
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 3
- WID-SEC-2026-2317 Microsoft Office Produkte: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 12, 2026
- NCSC-2026-0237 Kwetsbaarheden verholpen in Microsoft Office NCSC-NL (Netherlands) · Jul 21, 2026
- MSRC-CVE-2026-56164 Microsoft SharePoint Server Elevation of Privilege Vulnerability Microsoft Security Response Center · Jul 14, 2026
References
- Microsoft SharePoint Server Elevation of Privilege Vulnerability vendor-advisory patch