CVE-2026-35439: 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-2026-35439) affects Microsoft SharePoint Enterprise Server 2016 (version 16.0.0). It is caused by improper deserialization of untrusted data, which can lead to remote code execution by an attacker with authorized access. The CVSS v3.1 base score is 8.8, indicating high impact on confidentiality, integrity, and availability. Microsoft has released an official patch to remediate this issue as documented 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
Apply the official security update provided by Microsoft as detailed in their advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-35439. This patch addresses the deserialization vulnerability and mitigates the risk of remote code execution. No additional mitigation steps are indicated by the vendor.
CVE-2026-35439: 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
Microsoft
Microsoft SharePoint Enterprise Server 2016
Microsoft
Microsoft SharePoint Server 2019
Microsoft
Microsoft SharePoint Server Subscription Edition
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-35439) affects Microsoft SharePoint Enterprise Server 2016 (version 16.0.0). It is caused by improper deserialization of untrusted data, which can lead to remote code execution by an attacker with authorized access. The CVSS v3.1 base score is 8.8, indicating high impact on confidentiality, integrity, and availability. Microsoft has released an official patch to remediate this issue as documented 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
Apply the official security update provided by Microsoft as detailed in their advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-35439. This patch addresses the deserialization vulnerability and mitigates the risk of remote code execution. No additional mitigation steps are indicated by the vendor.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-04-02T19:21:11.805Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-35439","vendor":"Microsoft"}]
Threat ID: 6a03654ccbff5d861008c812
Added to database: 05/12/2026, 17:37:16 UTC
Last enriched: 08/11/2026, 16:42:57 UTC
Last updated: 09/14/2026, 22:01:33 UTC
Views: 81
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