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 (CWE-306) in Microsoft SharePoint Enterprise Server 2016 involves missing authentication for a critical function, which could allow an attacker to elevate privileges remotely without prior authentication. The CVSS 3.1 base score is 5.3, reflecting network attack vector, low attack complexity, no privileges required, no user interaction, and impact limited to integrity. Microsoft has published an official fix for this issue.
Potential Impact
An attacker who exploits this vulnerability can elevate privileges on the affected SharePoint server remotely without authentication. This could lead to unauthorized modification of data or configuration within the SharePoint environment. There is no impact on confidentiality or availability according to the CVSS vector. No known exploits are reported in the wild at this time.
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 Response Center advisory 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 (CWE-306) in Microsoft SharePoint Enterprise Server 2016 involves missing authentication for a critical function, which could allow an attacker to elevate privileges remotely without prior authentication. The CVSS 3.1 base score is 5.3, reflecting network attack vector, low attack complexity, no privileges required, no user interaction, and impact limited to integrity. Microsoft has published an official fix for this issue.
Potential Impact
An attacker who exploits this vulnerability can elevate privileges on the affected SharePoint server remotely without authentication. This could lead to unauthorized modification of data or configuration within the SharePoint environment. There is no impact on confidentiality or availability according to the CVSS vector. No known exploits are reported in the wild at this time.
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 Response Center advisory 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: 08/13/2026, 15:45:23 UTC
Last updated: 08/27/2026, 11:04:03 UTC
Views: 101
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