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, identified as CWE-502, occurs due to improper handling of deserialization of untrusted data in Microsoft SharePoint Enterprise Server 2016 (version 16.0.0). An attacker with authorized access can exploit this flaw to execute arbitrary code remotely, potentially leading to full compromise of the affected system. The CVSS v3.1 base score is 8.8, reflecting high impact on confidentiality, integrity, and availability. 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, potentially leading to full system compromise including unauthorized data access, modification, or denial of service.
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-2026-45659 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, identified as CWE-502, occurs due to improper handling of deserialization of untrusted data in Microsoft SharePoint Enterprise Server 2016 (version 16.0.0). An attacker with authorized access can exploit this flaw to execute arbitrary code remotely, potentially leading to full compromise of the affected system. The CVSS v3.1 base score is 8.8, reflecting high impact on confidentiality, integrity, and availability. 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, potentially leading to full system compromise including unauthorized data access, modification, or denial of service.
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-2026-45659 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: 08/11/2026, 13:46:28 UTC
Last updated: 08/26/2026, 22:52:10 UTC
Views: 354
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