Check Point Advisories

Microsoft SharePoint Server Authentication Bypass (CVE-2025-49706; CVE-2025-53771)

Vulnerability
Protection

Check Point Reference:	CPAI-2025-16391
Date Published:	21 Jul 2025
Severity:	Critical
Last Updated:	Sunday 31 May, 2026
Source:
Industry Reference:	CVE-2025-49706 CVE-2025-53771
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Microsoft SharePoint Enterprise Server 2016 Microsoft SharePoint Server subscription and prior to 16.0.18526.20424 Microsoft SharePoint Server 2019
Vulnerability Description	An authentication bypass vulnerability in Microsoft SharePoint Server allows attackers to bypass authentication and perform spoofing 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

In the IPS tab, click Protections and find the Microsoft SharePoint Server Authentication Bypass protection using the Search tool and Edit the protection's settings.
Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name: Content Protection Violation.
Attack Information: Microsoft SharePoint Server Authentication Bypass