Main Vulnerability Database Vulnerabilities #VU123813

Deserialization of Untrusted Data in Microsoft SharePoint Enterprise Server and Microsoft SharePoint Server - CVE-2026-26114

Published: March 11, 2026

Vulnerability identifier: #VU123813

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-26114

CWE-ID: CWE-502

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to insecure input validation when processing serialized data in Microsoft SharePoint Server. A remote user can pass specially crafted data to the application and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Affected software

Microsoft SharePoint Enterprise Server
Microsoft SharePoint Server

How to mitigate CVE-2026-26114

Install updates from vendor's website.

Microsoft SharePoint Enterprise Server - update to 16.0.5543.1000
Microsoft SharePoint Server - update to 16.0.10417.20102

External References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26114

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