CVE-2026-65663: 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-2026-65663) in Microsoft SharePoint Enterprise Server 2016 is caused by improper handling of deserialization of untrusted data, classified under CWE-502. It enables an attacker with authorized access to execute arbitrary code remotely. The CVSS 3.1 base score is 8.8, indicating high severity, with network attack vector, low attack complexity, and no user interaction required. Microsoft has published an official fix for this vulnerability, and details are available in their security update guide.
Potential Impact
Successful exploitation allows an authorized attacker to execute arbitrary code remotely on the affected SharePoint server, potentially leading to full compromise of the system, including confidentiality, integrity, and availability impacts.
Mitigation Recommendations
An official fix is available from Microsoft for this vulnerability. It is recommended to apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65663 to remediate the issue.
CVE-2026-65663: 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-2026-65663) in Microsoft SharePoint Enterprise Server 2016 is caused by improper handling of deserialization of untrusted data, classified under CWE-502. It enables an attacker with authorized access to execute arbitrary code remotely. The CVSS 3.1 base score is 8.8, indicating high severity, with network attack vector, low attack complexity, and no user interaction required. Microsoft has published an official fix for this vulnerability, and details are available in their security update guide.
Potential Impact
Successful exploitation allows an authorized attacker to execute arbitrary code remotely on the affected SharePoint server, potentially leading to full compromise of the system, including confidentiality, integrity, and availability impacts.
Mitigation Recommendations
An official fix is available from Microsoft for this vulnerability. It is recommended to apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65663 to remediate the issue.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-07-22T18:16:01.897Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65663","vendor":"Microsoft"}]
Threat ID: 6a7b582dbf8831d53915636e
Added to database: 08/11/2026, 17:13:17 UTC
Last enriched: 08/11/2026, 20:12:29 UTC
Last updated: 08/12/2026, 00:21:09 UTC
Views: 2
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