CVE-2026-65658: CWE-502: Deserialization of Untrusted Data in Microsoft Microsoft SharePoint Enterprise Server 2016
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-65658) affects Microsoft SharePoint Enterprise Server 2016 version 16.0.0. It is caused by unsafe deserialization of untrusted data, classified under CWE-502. Exploitation requires an attacker with authorized access and allows remote code execution with high impact on confidentiality, integrity, and availability. The CVSS v3.1 base score is 8.8, indicating a high severity. Microsoft has published an official fix for this vulnerability, as detailed in their security update guide.
Potential Impact
Successful exploitation enables an authorized attacker to execute arbitrary code remotely on the affected SharePoint server. This compromises system confidentiality, integrity, and availability, potentially allowing full control over the affected system.
Mitigation Recommendations
An official fix is available from Microsoft. Administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65658 to remediate this vulnerability.
CVE-2026-65658: CWE-502: Deserialization of Untrusted Data in Microsoft Microsoft SharePoint Enterprise Server 2016
Description
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
CVSS v3.1
Score 8.8high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-65658) affects Microsoft SharePoint Enterprise Server 2016 version 16.0.0. It is caused by unsafe deserialization of untrusted data, classified under CWE-502. Exploitation requires an attacker with authorized access and allows remote code execution with high impact on confidentiality, integrity, and availability. The CVSS v3.1 base score is 8.8, indicating a high severity. Microsoft has published an official fix for this vulnerability, as detailed in their security update guide.
Potential Impact
Successful exploitation enables an authorized attacker to execute arbitrary code remotely on the affected SharePoint server. This compromises system confidentiality, integrity, and availability, potentially allowing full control over the affected system.
Mitigation Recommendations
An official fix is available from Microsoft. Administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65658 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-07-22T18:16:01.896Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65658","vendor":"Microsoft"}]
Threat ID: 6a7b582dbf8831d539156362
Added to database: 08/11/2026, 17:13:17 UTC
Last enriched: 08/11/2026, 20:12:58 UTC
Last updated: 08/12/2026, 00:21:15 UTC
Views: 2
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