Summary
Impact: Remote Code Execution. Microsoft rating: Important. Not known to be exploited — Exploitation More Likely. Customer action: Required.
Details
According to the CVSS metric, the attack vector is network (AV:N) and the user interaction is required (UI:R). What is the target context of the remote code execution?
This attack requires a client to connect to a malicious server, and that could allow the attacker to gain code execution on the client.
How could an attacker exploit the vulnerability?
In a network-based attack, an attacker authenticated as at least a Site Owner, could write arbitrary code to inject and execute code remotely on the SharePoint Server.
Security updates
16.0.5487.1000 — https://support.microsoft.com/help/5002685
16.0.10416.20050 — https://support.microsoft.com/help/5002678
16.0.17928.20396 — https://support.microsoft.com/help/5002681
Vulnerabilities 1
-
High 8.0CVE-2025-21400 EPSS 34%
Microsoft SharePoint Server Remote Code Execution Vulnerability
Microsoft SharePoint Server Remote Code Execution Vulnerability
Revision history
-
#1
Information published.
References
-
CVE-2025-21400 Microsoft SharePoint Server Remote Code Execution Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21400
-
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
-
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
-
Common Vulnerability Scoring System
https://www.first.org/cvss