CVE-2026-63516: Microsoft SharePoint Server Spoofing Vulnerability
Published Aug 11, 2026
·Updated
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.
Other sources
Microsoft SharePoint Server Spoofing Vulnerability
— Microsoft
Affected Software
6 affected componentsFixes available
Microsoft SharePoint Server Subscription Edition<16.0.19725.20522
16.0.19725.20522
Microsoft SharePoint Server 2019<16.0.10417.20198
16.0.10417.20198
Microsoft SharePoint Enterprise Server 2016<16.0.5565.1001
16.0.5565.1001
Microsoft SharePoint Server<16.0.19725.20522
Microsoft SharePoint Server=2016
Microsoft SharePoint Server=2019
Remediation
Event History
Aug 11, 2026
CVE Published
via Microsoft·02:00 PM
Data Sourced
via Microsoft·02:00 PM
DescriptionSeverityWeakness
Data Sourced
via Microsoft·02:00 PM
Affected Software
Updated
via Microsoft·02:00 PM
Description
CVE Published
via MITRE·05:03 PM
Data Sourced
via MITRE·05:03 PM
DescriptionSeverity
Data Sourced
via NVD·05:18 PM
RemedyDescriptionSeverityWeaknessAffected Software
Frequently Asked Questions
1
What is the severity of CVE-2026-63516?
The severity of CVE-2026-63516 is medium with a score of 6.5 according to the CVSS metrics.
2
How do I fix CVE-2026-63516?
To fix CVE-2026-63516, apply the security updates provided by Microsoft for the affected SharePoint Server versions.
3
What impact does CVE-2026-63516 have on Microsoft SharePoint?
CVE-2026-63516 can allow an authorized attacker to perform spoofing attacks over a network.
4
Which Microsoft SharePoint versions are affected by CVE-2026-63516?
CVE-2026-63516 affects Microsoft SharePoint Server Subscription Edition, Microsoft SharePoint Enterprise Server 2016, and Microsoft SharePoint Server 2019.
5
Is CVE-2026-63516 publicly known?
Yes, CVE-2026-63516 was published on August 11, 2026.