CVE-2026-56164: CWE-306: Missing Authentication for Critical Function in Microsoft Microsoft SharePoint Enterprise Server 2016
Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-56164) in Microsoft SharePoint Enterprise Server 2016 (version 16.0.0) is classified as CWE-306: Missing Authentication for a critical function. It enables an attacker to elevate privileges remotely without requiring user interaction or prior privileges. The CVSS 3.1 vector indicates network attack vector, low attack complexity, no privileges required, no user interaction, and impact limited to integrity loss. Microsoft has published an official fix for this vulnerability.
Potential Impact
An attacker can exploit this vulnerability to elevate privileges on the affected SharePoint server remotely, potentially allowing unauthorized modification of data or configuration. There is no impact on confidentiality or availability reported. No known exploits are currently observed in the wild.
Mitigation Recommendations
An official fix is available from Microsoft. Users of Microsoft SharePoint Enterprise Server 2016 version 16.0.0 should apply the vendor-provided patch as detailed in the Microsoft security update guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56164 to remediate this vulnerability.
CVE-2026-56164: CWE-306: Missing Authentication for Critical Function in Microsoft Microsoft SharePoint Enterprise Server 2016
Description
Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.
CVSS v3.1
Score 5.3medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-56164) in Microsoft SharePoint Enterprise Server 2016 (version 16.0.0) is classified as CWE-306: Missing Authentication for a critical function. It enables an attacker to elevate privileges remotely without requiring user interaction or prior privileges. The CVSS 3.1 vector indicates network attack vector, low attack complexity, no privileges required, no user interaction, and impact limited to integrity loss. Microsoft has published an official fix for this vulnerability.
Potential Impact
An attacker can exploit this vulnerability to elevate privileges on the affected SharePoint server remotely, potentially allowing unauthorized modification of data or configuration. There is no impact on confidentiality or availability reported. No known exploits are currently observed in the wild.
Mitigation Recommendations
An official fix is available from Microsoft. Users of Microsoft SharePoint Enterprise Server 2016 version 16.0.0 should apply the vendor-provided patch as detailed in the Microsoft security update guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56164 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-06-19T13:53:31.988Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56164","vendor":"Microsoft"}]
Threat ID: 6a566f8168715ace43e6bfab
Added to database: 07/14/2026, 17:18:57 UTC
Last enriched: 07/14/2026, 17:48:40 UTC
Last updated: 07/15/2026, 00:53:35 UTC
Views: 7
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