CVE-2026-45484: Microsoft SharePoint Elevation of Privilege Vulnerability
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to elevate privileges over a network.
Other sources
Microsoft SharePoint Elevation of Privilege Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.19725.20384Patch KB5002873 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.5556.1005Patch KB5002880 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.10417.20153Patch KB5002874
Event History
Frequently Asked Questions
What is the severity of CVE-2026-45484?
The severity of CVE-2026-45484 is rated as high with a score of 8.8.
How do I fix CVE-2026-45484?
To fix CVE-2026-45484, update your Microsoft SharePoint Server installation to the latest version as provided by Microsoft.
What type of vulnerability is CVE-2026-45484?
CVE-2026-45484 is an elevation of privilege vulnerability due to deserialization of untrusted data.
Which products are affected by CVE-2026-45484?
CVE-2026-45484 affects Microsoft SharePoint Server, Microsoft SharePoint Server 2019, SharePoint Server Subscription Edition, and SharePoint Enterprise Server 2016.
Can an authorized attacker exploit CVE-2026-45484 remotely?
Yes, an authorized attacker can exploit CVE-2026-45484 to elevate privileges over a network.