CVE-2026-70321: Microsoft SharePoint Remote Code Execution Vulnerability

Overview

Severity

High (CVSS 8.8)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Category

Remote Code Execution

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2026-Aug

Released

2026-08-11

Description

Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

FAQ

How could an attacker exploit this vulnerability? Successful exploitation of this vulnerability could allow an attacker the ability to gain remote code execution via an in-network attacker calling arbitrary endpoints.

Affected Products (1)

Microsoft Office

• Microsoft SharePoint Server Subscription Edition

Security Updates (1)

• 5002893

Acknowledgments

Kn1ght

Revision History

• 2026-08-11: Information published.