Patch tracker / KB5094006

KB5094006: Windows Server 2019 Security Update (June 2026)

KB5094006 is a High security update for Windows Server 2019, released 2026-06-09. It closes 1 CVE with a maximum CVSS of 7.8. The most likely of them to be attacked is CVE-2026-45592, which FIRST.org rates at 54% probability of exploitation in the next 30 days.

Update summary

High
2026-06-09
Released
1
CVEs fixed
7.8
Max CVSS
High
Severity
Deploy this cycle
Fixes 1 CVE for Windows Server 2019. 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 Windows 10 Version 1809 for 32-bit Systems has shipped since this one: KB5089548 (2026-07-14). 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.

Senserva found thisread these before you deploy broadly

Microsoft documents 1 known issue with this update.

  • We are currently not aware of any issues in this update.

The full text, quoted from Microsoft

Microsoft Update Catalog: download KB5094006Microsoft support article
Senserva AI Opinion for KB5094006

KB5094006 is a June 2026 update for Windows 10 version 1809 and Windows Server 2019 that patches a single flaw, CVE-2026-45592, rated High severity at CVSS 7.8. The 7.8 score with no network vector points to a local elevation of privilege issue, meaning an attacker needs an existing foothold to exploit it. EPSS is 0 percent and it is not in CISA KEV nor linked to ransomware, so this is a routine patch rather than an emergency.

Do this: Deploy KB5094006 to your remaining 1809 and Server 2019 machines during your normal June patch cycle.

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

Senserva AI Opinion and rich prompt for KB5094006

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

Full tracking and change history for KB5094006

Released
2026-06-09
Last changed
2026-06-09
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 KB5094006 is installed

Elevated PowerShell. No output means it is not installed.

Known issues, from Microsoft

Quoted from Microsoft's support article for KB5094006 (checked 2026-08-06). Verify against the article before acting.

We are currently not aware of any issues in this update.

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-2026-45592Critical9.854%No

Scope and sources

Affected products
Also released in June 2026

KB5094139

8 CVEs · High · exploited

KB5094140

8 CVEs · High · exploited

KB5094142

8 CVEs · High · exploited

KB5094144

8 CVEs · High · exploited

KB5087423

66 CVEs · Critical

KB5087539

66 CVEs · Critical

KB5089466

61 CVEs · Critical

KB5089549

61 CVEs · Critical

The full month, summarized: Microsoft Patch Tuesday.

Authoritative references
Official KB5094006 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.