CVE-2026-63516: Microsoft SharePoint Server Spoofing Vulnerability
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
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 16.0.19725.20522Patch KB5002893 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.5565.1001Patch KB5002906 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.10417.20198Patch KB5002896
Event History
Frequently Asked Questions
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.
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.
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.
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.
Is CVE-2026-63516 publicly known?
Yes, CVE-2026-63516 was published on August 11, 2026.