Patch tracker / KB5093780

KB5093780: Microsoft Dynamics 365 Business Centra Security Update (May 2026)

KB5093780 is a High security update for Microsoft Dynamics 365 Business Centra, released 2026-05-12. It closes 1 CVE with a maximum CVSS of 7.8. It is the 37th largest of the 61 updates Microsoft shipped that month, by CVEs closed.

Update summary

High
2026-05-12
Released
1
CVEs fixed
7.8
Max CVSS v3
High
Severity
Deploy this cycle
Fixes 1 CVE for Microsoft Dynamics 365 Business Centra. No confirmed in-the-wild exploitation in this set today.

Fixes 1 CVE. Most severe CVSS 7.8 (High). EPSS exploit probability up to <1%. Among the lower half of tracked Microsoft updates by EPSS exploit probability.

Senserva found thiswe track every release for this product line, so we can tell you this package is behind

A newer security update for Microsoft Dynamics 365 Business Central 2026 Release Wave 1 has shipped since this one: KB5100263 (2026-08-11). For cumulative update families the newer package includes these fixes, so installing that one is usually the shorter path. Verify against your own update rings before you skip this package.

Microsoft Update Catalog: download KB5093780Microsoft support article
Senserva AI Opinion for KB5093780

KB5093780 patches a single flaw, CVE-2026-40417, across three Dynamics 365 Business Central waves including the 2026 Release Wave 1 line, rated High at CVSS 7.8. The 7.8 score points to a client or local code execution style issue rather than an unauthenticated network exploit, and the EPSS of 0 percent with no CISA KEV listing means no observed exploitation yet. Anyone running Business Central on these three release waves should treat this as the current baseline patch.

Do this: Identify which of the three Business Central release waves your tenants run and apply KB5093780 to each affected environment.

AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.

Senserva AI Opinion and rich prompt for KB5093780

Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.

Full tracking and change history for KB5093780

Released
2026-05-12
Last changed
2026-05-12
Changes tracked
1

Senserva began recording day-to-day change history on 2026-07-07, and refreshes it several times a day. Release dates are historical where Microsoft publishes them; revision history is tracked from that date forward, so it does not include changes made before then.

Check if KB5093780 is installed

Elevated PowerShell. No output means it is not installed.

CVEs fixed by this update

Sorted exploited-first, then by CVSS. Every CVE links to its Senserva page with the full risk facts, references, and a ready-to-paste AI prompt.

CVESeverityCVSSEPSSExploited
CVE-2026-40417High7.8<1%No

Scope and sources

Affected products
Also released in May 2026

KB5002863

9 CVEs · High · exploited

KB5002868

9 CVEs · High · exploited

KB5002870

9 CVEs · High · exploited

KB5094139

1 CVE · High · exploited

KB5094140

1 CVE · High · exploited

KB5094142

1 CVE · High · exploited

KB5094144

1 CVE · High · exploited

KB5078943

3 CVEs · Critical

The full month, summarized: Microsoft Patch Tuesday.

Authoritative references
Official KB5093780 page (Microsoft Support)Microsoft Update CatalogMicrosoft Security Update Guide

See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.

New to a term on this page? CVE, KB, KEV, CVSS, and EPSS are each explained once, on the Senserva security lexicon. Reference: Microsoft CVE and vulnerability management and the Microsoft patching guide.
Provided as is, without warranty; verify against the vendor advisory before acting. Data notice and terms.