High7.8Microsoft Server

High [CVE-2026-55006] Microsoft Exchange Server Elevation of Privilege Vulnerability

This high-severity Microsoft Server advisory covers CVE-2026-55006 affecting Microsoft Exchange Server 2019 Cumulative Update 14, Microsoft Exchange Server 2019 Cumulative Update 15, Microsoft Exchange Server 2016 Cumulative Update 23.

CVE-2026-55006 Published Jul 14, 2026Updated by vendor Jul 14, 2026

CVE-2026-55006

Affected products & platforms

Microsoft ServerExchange Server

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Summary

Microsoft Exchange Server Elevation of Privilege Vulnerability

Affected products named by the advisory: Microsoft Exchange Server 2019 Cumulative Update 14; Microsoft Exchange Server 2019 Cumulative Update 15; Microsoft Exchange Server 2016 Cumulative Update 23; Microsoft Exchange Server Subscription Edition RTM.

Affected versions

Microsoft Exchange Server 2016 Cumulative Update 23 15.01.0.0
Microsoft Exchange Server 2019 Cumulative Update 14 15.02.0.0
Microsoft Exchange Server 2019 Cumulative Update 15 15.02.0.0
Microsoft Exchange Server Subscription Edition RTM 15.02.0.0

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

Fixed versions

KB5103214 (build 15.02.1544.043)
KB5103213 (build 15.02.1748.048)
KB5103215 (build 15.01.2507.071)
KB5103212 (build 15.02.2562.045)

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: KB5103214, KB5103213, KB5103215, KB5103212 (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 for the summary, affected/fixed versions and remediation guidance it provides.
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-2026-55006NVD CVE.org MITRE

Official resources

Microsoft Update Catalog: KB5103214
Official documentation
Direct download of the KB5103214 security update named in the MSRC remediation data for this CVE.
Microsoft Update Catalog: KB5103213
Official documentation
Direct download of the KB5103213 security update named in the MSRC remediation data for this CVE.
Microsoft Update Catalog: KB5103215
Official documentation
Direct download of the KB5103215 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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