Check Point Advisories

Microsoft SharePoint Server Insecure Deserialization (CVE-2026-33112)

Check Point Reference: CPAI-2026-9660
Date Published: 27 Jul 2026
Severity: High
Last Updated: Monday 27 July, 2026
Source:
Industry Reference:CVE-2026-33112
Protection Provided by:

Security Gateway
R81, R80, R77, R75
Who is Vulnerable? Microsoft SharePoint Server prior to 16.0.19725.20280
Microsoft SharePoint Server 2016
Microsoft SharePoint Server 2019
Vulnerability Description An insecure deserialization vulnerability in Microsoft SharePoint Server allows an authorized attacker to execute code over a network.

Protection Overview

This protection detects attempts to exploit this vulnerability.

In order for the protection to be activated, update your Security Gateway product to the latest IPS update. For information on how to update IPS, go to SBP-2006-05, click on Protection tab and select the version of your choice.

Security Gateway R81 / R80 / R77 / R75

  1. In the IPS tab, click Protections and find the Microsoft SharePoint Server Insecure Deserialization (CVE-2026-33112) protection using the Search tool and Edit the protection's settings.
  2. Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name:  Windows SMB Protection Violation.
Attack Information:  Microsoft SharePoint Server Insecure Deserialization (CVE-2026-33112)

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