MSRC-CVE-2026-45454 — Microsoft SharePoint Remote Code Execution Vulnerability

Summary

Impact: Remote Code Execution. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.

Details

According to the CVSS metric, privileges required is low (PR:L). What does that mean for this vulnerability?
Any authenticated attacker could trigger this vulnerability. It does not require admin or other elevated privileges.

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.

Security updates
16.0.5556.1005 — https://support.microsoft.com/help/5002880
16.0.10417.20153 — https://support.microsoft.com/help/5002874
16.0.19725.20384 — https://support.microsoft.com/help/5002873

Vulnerabilities 1

Medium 6.5

CVE-2026-45454

Microsoft SharePoint Remote Code Execution Vulnerability

Improper limitation of a pathname to a restricted directory ('path traversal') in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

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

Jun 9, 2026

Revision history

2026-06-09 #1
Information published.

References

CVE-2026-45454 Microsoft SharePoint Remote Code Execution Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45454
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