SB2025040955 - Multiple vulnerabilities in Microsoft SharePoint

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Improper Authorization (CVE-ID: CVE-2025-29794)

The vulnerability allows a remote attacker to bypass authorization checks.

The vulnerability exists due to insufficient authorization controls in Microsoft SharePoint. A remote user can bypass authorization and execute arbitrary code on the target system.

2) Deserialization of Untrusted Data (CVE-ID: CVE-2025-29793)

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

The vulnerability exists due to insecure input validation when processing serialized data in Microsoft SharePoint. A remote administrator 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.

Remediation

Install update from vendor's website.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-29794
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-29793