Code Injection in Microsoft SharePoint Foundation and Microsoft SharePoint Server - CVE-2021-26420
Published: June 8, 2021 / Updated: June 25, 2021
Vulnerability identifier: #VU53877
CSH Severity: Medium
CVSS v4: 7.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-26420
CWE-ID: CWE-94
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to improper input validation within the System.Workflow.ComponentModel.Compiler.WorkflowCompilerInternal class in the Microsoft SharePoint Server. A remote authenticated attacker can send a specially crafted request and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
Microsoft SharePoint Foundation
Microsoft SharePoint Server
Microsoft SharePoint Server
How to mitigate CVE-2021-26420
Install updates from vendor's website.