Patch tracker / KB5086070
KB5086070: Microsoft Dynamics 365 Business Centra Security Update (May 2026)
KB5086070 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
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.
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.
KB5086070 patches a single vulnerability (CVE-2026-40417) rated High at CVSS 7.8 across three Business Central release waves, spanning the 2025 and upcoming 2026 Wave 1 releases. The 7.8 score with no attack complexity discount suggests a local or authenticated path to elevated privileges, and organizations running any of these three Business Central versions are affected. There is no known exploitation yet: EPSS is 0 percent and it is not on the CISA KEV list.
Do this: Apply KB5086070 to your Business Central environments, prioritizing whichever release wave (2025 Wave 1, 2025 Wave 2, or 2026 Wave 1) you actually run.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5086070
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5086070
- 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 KB5086070 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.
| CVE | Severity | CVSS | EPSS | Exploited |
|---|---|---|---|---|
| CVE-2026-40417 | High | 7.8 | <1% | No |
Scope and sources
- Affected products
- Also released in May 2026
KB5002863
9 CVEs · High · exploitedKB5002868
9 CVEs · High · exploitedKB5002870
9 CVEs · High · exploitedKB5094139
1 CVE · High · exploitedKB5094140
1 CVE · High · exploitedKB5094142
1 CVE · High · exploitedKB5094144
1 CVE · High · exploitedKB5078943
3 CVEs · CriticalThe full month, summarized: Microsoft Patch Tuesday.
- Authoritative references
See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.