CVE-2021-43876: Microsoft SharePoint Elevation of Privilege 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

Elevation of Privilege

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2021-Dec

Released

2021-12-14

EPSS Score

1.35% (percentile: 80.1%)

FAQ

According to the CVSS metric, privileges required is low (PR:L). What does that mean for this vulnerability? The attacker must be authenticated to the target site, with the rights to use the SharePoint Migration tool and the ability to create a new SharePoint site collection.

Affected Products (3)

Microsoft Office

• Microsoft SharePoint Enterprise Server 2016
• Microsoft SharePoint Enterprise Server 2013 Service Pack 1
• Microsoft SharePoint Server 2019

Security Updates (3)

• 5002055
• 5002008
• 5002054

Acknowledgments

Anonymous finder

Revision History

• 2021-12-14: Information published.