High [CVE-2026-64900] Microsoft SharePoint Server Spoofing Vulnerability
This high-severity Microsoft Server advisory covers CVE-2026-64900 affecting Microsoft SharePoint Enterprise Server 2016, Microsoft SharePoint Server 2019, Microsoft SharePoint Server Subscription Edition.
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Summary
Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.
Affected products named by the advisory: Microsoft SharePoint Enterprise Server 2016; Microsoft SharePoint Server 2019; Microsoft SharePoint Server Subscription Edition.
- Microsoft SharePoint Enterprise Server 2016 16.0.0 before 16.0.5565.1001
- Microsoft SharePoint Server 2019 16.0.0 before 16.0.10417.20198
- Microsoft SharePoint Server Subscription Edition 16.0.0 before 16.0.19725.20522
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
- 16.0.5565.1001
- 16.0.10417.20198
- 16.0.19725.20522
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation
Upgrade to a fixed release: 16.0.5565.1001, 16.0.10417.20198, 16.0.19725.20522. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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