CVE-2026-65665: CWE-502: Deserialization of Untrusted Data in Microsoft Microsoft SharePoint Server 2019
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
AI Analysis
Technical Summary
This vulnerability (CWE-502) in Microsoft SharePoint Server 2019 arises from improper deserialization of untrusted data, enabling an attacker with authorized access to execute code remotely. The CVSS 3.1 base score is 8.8, reflecting high impact on confidentiality, integrity, and availability. The vulnerability affects version 16.0.0 of SharePoint Server 2019. Microsoft has published an official fix to remediate this issue.
Potential Impact
Successful exploitation allows an authorized attacker to execute arbitrary code remotely, potentially leading to full compromise of the affected SharePoint server, impacting confidentiality, integrity, and availability of the system.
Mitigation Recommendations
An official fix is available from Microsoft. Users should apply the patch provided in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65665 to remediate this vulnerability.
CVE-2026-65665: CWE-502: Deserialization of Untrusted Data in Microsoft Microsoft SharePoint Server 2019
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 (CWE-502) in Microsoft SharePoint Server 2019 arises from improper deserialization of untrusted data, enabling an attacker with authorized access to execute code remotely. The CVSS 3.1 base score is 8.8, reflecting high impact on confidentiality, integrity, and availability. The vulnerability affects version 16.0.0 of SharePoint Server 2019. Microsoft has published an official fix to remediate this issue.
Potential Impact
Successful exploitation allows an authorized attacker to execute arbitrary code remotely, potentially leading to full compromise of the affected SharePoint server, impacting confidentiality, integrity, and availability of the system.
Mitigation Recommendations
An official fix is available from Microsoft. Users should apply the patch provided in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65665 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-07-22T18:16:01.897Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65665","vendor":"Microsoft"}]
Threat ID: 6a7b582dbf8831d539156374
Added to database: 08/11/2026, 17:13:17 UTC
Last enriched: 08/11/2026, 20:12:14 UTC
Last updated: 08/12/2026, 04:26:59 UTC
Views: 5
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