Microsoft SharePoint Server Remote Code Execution Vulnerability

Source data

Overview

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

Impact & technical details

Remote Code Execution

How could an attacker exploit the vulnerability? In a network-based attack, an authenticated attacker, as at least a Site Owner, could write arbitrary code to inject and execute code remotely on the SharePoint Server.

I am running SharePoint Server 2016. Do the updates for SharePoint Enterprise Server 2016 also apply to the version I am running? Yes. The same KB number applies to both SharePoint Server 2016 and SharePoint Enterprise Server 2016. Customers running either version should install the security update to be protected from this vulnerability.

There are multiple update packages available for some of the affected software. Do I need to install all the updates listed in the Security Updates table for the software? Yes. Customers should apply all updates offered for the software installed on their systems. If multiple updates apply, they can be installed in any order.

CVSS base score

8.8 / 10

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

Highest base score supplied by MSRC for this record; the vector belongs to that score. Ratings can vary by product. Microsoft Important is displayed as High; Moderate is displayed as Medium.

Affected products

• Microsoft SharePoint Enterprise Server 2016
• Microsoft SharePoint Server 2019
• Microsoft SharePoint Server Subscription Edition

Source guidance

Remediation

The source provides update references without a separate remediation summary. Review the applicable update links below.

At least one Microsoft vendor-fix reference is available. Check each affected product for its applicable update, prerequisites, and supported version.

Authoritative sources & updates

Findings and update information come from the linked publishers. GTP compiles the public record and provides the recommendation above. CVSS ratings shown here come from Microsoft. NVD references provide additional public context.

• Microsoft Security Response Center (opens in a new tab)
• Microsoft security update · 5002905 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5002906 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5002894 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5002896 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)
• Microsoft security update · 5002893 (opens in a new tab)
• Microsoft remediation guidance (opens in a new tab)