CVE-2026-40357: 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-2026-40357) 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 unsafe deserialization processes. The CVSS v3.1 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.
Potential Impact
Successful exploitation allows an attacker with authorized privileges to execute arbitrary code remotely, potentially leading to full compromise of the affected SharePoint server. The impact includes complete confidentiality, integrity, and availability loss as indicated by the CVSS metrics.
Mitigation Recommendations
Microsoft has released an official patch to remediate this vulnerability. Administrators should apply the provided update from the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40357 promptly to mitigate the risk. No additional mitigations are specified or required beyond applying the official fix.
CVE-2026-40357: 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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-40357) 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 unsafe deserialization processes. The CVSS v3.1 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.
Potential Impact
Successful exploitation allows an attacker with authorized privileges to execute arbitrary code remotely, potentially leading to full compromise of the affected SharePoint server. The impact includes complete confidentiality, integrity, and availability loss as indicated by the CVSS metrics.
Mitigation Recommendations
Microsoft has released an official patch to remediate this vulnerability. Administrators should apply the provided update from the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40357 promptly to mitigate the risk. No additional mitigations are specified or required beyond applying the official fix.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-04-11T23:06:15.613Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40357","vendor":"Microsoft"}]
Threat ID: 6a03654ccbff5d861008c818
Added to database: 5/12/2026, 5:37:16 PM
Last enriched: 5/12/2026, 7:06:21 PM
Last updated: 5/13/2026, 4:51:24 AM
Views: 2
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