CVE-2026-56157: CWE-284: Improper Access Control in Microsoft Microsoft SharePoint Enterprise Server 2016
Improper access control in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.
AI Analysis
Technical Summary
This vulnerability in Microsoft SharePoint Enterprise Server 2016 (version 16.0.0) involves improper access control (CWE-284) that could allow an authorized attacker to spoof identities over a network. The CVSS v3.1 base score is 5.4, reflecting a medium severity with network attack vector, low attack complexity, and requiring privileges. The vulnerability impacts confidentiality and integrity but not availability. Microsoft has published an official fix to remediate this issue.
Potential Impact
An authorized attacker could exploit this vulnerability to perform spoofing attacks over the network, potentially leading to unauthorized access or manipulation of data within SharePoint. The impact affects confidentiality and integrity but does not affect availability. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. It is recommended to apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56157 to remediate this vulnerability.
CVE-2026-56157: CWE-284: Improper Access Control in Microsoft Microsoft SharePoint Enterprise Server 2016
Description
Improper access control in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.
CVSS v3.1
Score 5.4medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in Microsoft SharePoint Enterprise Server 2016 (version 16.0.0) involves improper access control (CWE-284) that could allow an authorized attacker to spoof identities over a network. The CVSS v3.1 base score is 5.4, reflecting a medium severity with network attack vector, low attack complexity, and requiring privileges. The vulnerability impacts confidentiality and integrity but not availability. Microsoft has published an official fix to remediate this issue.
Potential Impact
An authorized attacker could exploit this vulnerability to perform spoofing attacks over the network, potentially leading to unauthorized access or manipulation of data within SharePoint. The impact affects confidentiality and integrity but does not affect availability. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. It is recommended to apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56157 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-2026-56157","vendor":"Microsoft"}]
Threat ID: 6a5676b968715ace43f0ae27
Added to database: 07/14/2026, 17:49:45 UTC
Last enriched: 07/14/2026, 19:03:44 UTC
Last updated: 07/15/2026, 00:47:23 UTC
Views: 3
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