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 arises from improper handling of deserialization of untrusted data, classified under CWE-502. Exploitation requires an attacker with authorized access and can lead to 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 released an official fix for this vulnerability, 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. This can compromise system confidentiality, integrity, and availability, potentially leading to full system compromise.
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-2026-35439 to remediate this vulnerability.
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
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 arises from improper handling of deserialization of untrusted data, classified under CWE-502. Exploitation requires an attacker with authorized access and can lead to 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 released an official fix for this vulnerability, 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. This can compromise system confidentiality, integrity, and availability, potentially leading to full system compromise.
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-2026-35439 to remediate this vulnerability.
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: 06/19/2026, 17:35:39 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 67
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