Advisory severityCritical9.3Vendor: HighMicrosoft Server

Critical [CVE-2026-70306] Microsoft Office SharePoint Spoofing Vulnerability

This critical-severity Microsoft Server advisory covers CVE-2026-70306 affecting Microsoft SharePoint Enterprise Server 2016, Microsoft SharePoint Server 2019, Microsoft SharePoint Server Subscription Edition.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-70306 Source published Aug 11, 2026Source updated Aug 11, 2026

VulniPulse record published Aug 11, 2026

CVE-2026-70306

Affected products & platforms

Microsoft ServerSharePoint Server

Open source advisory

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Summary

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an unauthorized 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.

Affected versions

Microsoft SharePoint Enterprise Server 2016 16.0.0 before 16.0.5561.1001
Microsoft SharePoint Server 2019 16.0.0 before 16.0.10417.20175
Microsoft SharePoint Server Subscription Edition 16.0.0 before 16.0.19725.20434

Official advisory · high-confidence parse· fetched 1 month ago·verify at source

Fixed versions

KB5002905 (build 16.0.5565.1001)
KB5002894 (build 16.0.10417.20198)
KB5002893 (build 16.0.19725.20522)

Official advisory · high-confidence parse· fetched 1 month ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Install the applicable security update for your platform: KB5002905, KB5002894, KB5002893 (see the Microsoft Update Catalog).

Official advisory · high-confidence parse· fetched 1 month ago·verify at source

Sources

Official and corroborating records used to build this advisory.

Microsoft Security Update Guide (MSRC)official
Official vendor source used to discover this advisory; it remains the authority for affected products and remediation. Discovered from the machine-readable feed https://api.msrc.microsoft.com/cvrf/v3.0/updates; this link opens the Microsoft Server advisory index instead of the raw feed document.
Microsoft Server
Official vendor advisoryofficial
Official advisory page fetched and parsed; accepted detail fields are attributed to this page.
Microsoft Server
CVE.org CNA affected-product recordCVE.org
Structured CNA affected[] data independently confirmed the affected product scope; native advisory content remains authoritative.
CVE Program

Cross-references

Validate CVE metadata against the authoritative registries.

CVE-2026-70306NVD CVE.org MITRE

Official resources

Microsoft Update Catalog: KB5002905
Official documentation
Direct download of the KB5002905 security update named in the MSRC remediation data for this CVE.
Microsoft Update Catalog: KB5002894
Official documentation
Direct download of the KB5002894 security update named in the MSRC remediation data for this CVE.
Microsoft Update Catalog: KB5002893
Official documentation
Direct download of the KB5002893 security update named in the MSRC remediation data for this CVE.
MSRC Security Update Guide
Official documentation
Filter by this CVE for per-product KB numbers, severity and exploitability assessment.

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