CVE-2026-45659: 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-2026-45659) affects Microsoft SharePoint Enterprise Server 2016 (version 16.0.0) and is classified as CWE-502: Deserialization of Untrusted Data. It enables an attacker with authorized access to execute code remotely by exploiting improper handling of serialized data. The CVSS v3.1 base score is 8.8, indicating high impact on confidentiality, integrity, and availability. Microsoft has released an official fix for this vulnerability as detailed 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 unauthorized access, data modification, and service disruption.
Mitigation Recommendations
An official fix is available from Microsoft. Users should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45659 to remediate this vulnerability.
CVE-2026-45659: 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-2026-45659) affects Microsoft SharePoint Enterprise Server 2016 (version 16.0.0) and is classified as CWE-502: Deserialization of Untrusted Data. It enables an attacker with authorized access to execute code remotely by exploiting improper handling of serialized data. The CVSS v3.1 base score is 8.8, indicating high impact on confidentiality, integrity, and availability. Microsoft has released an official fix for this vulnerability as detailed 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 unauthorized access, data modification, and service disruption.
Mitigation Recommendations
An official fix is available from Microsoft. Users should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45659 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-05-12T20:33:35.158Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45659","vendor":"Microsoft"}]
Threat ID: 6a10d8e7e1370fbb485de14e
Added to database: 05/22/2026, 22:29:59 UTC
Last enriched: 07/01/2026, 21:15:28 UTC
Last updated: 07/13/2026, 07:47:29 UTC
Views: 295
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