KB5094123: Windows Server 2019 Security Update (June 2026)

Download KB5094123

Get the official update for KB5094123. The download and file size for each supported product are on the Microsoft Update Catalog page.

Update summary

Senserva AI Opinion for KB5094123

KB5094123 is a large June 2026 rollup for Windows 10 1809 and Windows Server 2019 that closes 89 CVEs, with the worst rated Critical at CVSS 9.8 and one carrying a 48% EPSS score that signals meaningful near-term exploitation probability. No CVE here is in the CISA KEV catalog or tied to ransomware yet, but the volume and that elevated EPSS on a remotely reachable Critical flaw make this a priority for any surviving 1809 or Server 2019 fleet.

Do this: Deploy KB5094123 to your Windows 10 1809 and Server 2019 systems this cycle, prioritizing internet-facing Server 2019 hosts first.

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

Senserva AI Opinion and rich prompt for KB5094123

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

Full tracking and change history for KB5094123

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.

Exploitation and severity

Fixes 89 CVEs. Most severe CVSS 9.8 (Critical). EPSS exploit probability up to 48%.

Among the top 25% of tracked Microsoft updates by EPSS exploit probability.

What to do

Elevated priority: high severity or a meaningful exploitation probability, sooner if an affected product is internet-facing. Senserva flags whether KB5094123 is missing on your devices.

Check if KB5094123 is installed

Copy-paste PowerShell: one machine, or your whole fleet in one pass. No output means the update is not installed.

Get-HotFix covers Windows updates. Office, SharePoint, and Exchange server updates show under installed updates in Programs and Features, or check the Update Catalog history.

Writing about KB5094123? Cite this page

Copy-paste for a blog post, forum answer, or internal doc. The link always carries the current risk data.

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.

What the press says about this update

Trusted-source coverage of the CVEs this update fixes, pulled live from their own feeds.

Affected products

• Windows 10 Version 1809 for 32-bit Systems
• Windows 10 Version 1809 for x64-based Systems
• Windows Server 2019

Also released in June 2026

The highest-risk updates from the same release:

The full month, summarized: Microsoft Patch Tuesday.

How to install KB5094123

Any of these paths delivers KB5094123; most organizations already have one of the first three running:

• Intune update rings (Windows Update for Business): the update flows on each ring's deferral schedule.
• Windows Autopatch: rings, rollout, and pause or rollback are managed for you; exploited updates can be expedited.
• WSUS / Configuration Manager: approve KB5094123 for your device groups and set a deadline.
• Manual: download from the Update Catalog above and install; fine for a handful of machines, unmanageable at any real scale.

After the rollout, verify rather than assume: update compliance reporting in Intune or Autopatch shows which devices actually installed it, and Siemserva reads Intune, Defender, Autopatch, and Azure Update Manager together to show the devices still missing KB5094123, ranked by exploitation.

Common questions about KB5094123

Is KB5094123 urgent?

KB5094123 is rated Critical with a maximum CVSS of 9.8. No active exploitation is confirmed yet, so schedule it in your prompt patch cycle.

How do I download KB5094123?

From the Microsoft Update Catalog (linked on this page), or let Intune, Windows Update for Business, Windows Autopatch, or WSUS deliver it. The catalog page lists the download for each supported product.

How do I deploy KB5094123 with Intune?

Assign a Windows Update ring (quality update policy) to the device groups and the update flows on the ring's deferral schedule. For urgent updates, Intune expedite policies can bypass the ring deferrals. Verify the rollout with update compliance reporting rather than assuming delivery.

Can I ask my own AI about KB5094123?

Yes. This page includes a free, ready-to-paste AI prompt containing KB5094123's key facts: severity, CVE count, exploitation status, and the download link. Copy it into Claude, ChatGPT, or Copilot for a rollout plan; the data is refreshed three times a day (5 AM, 12:30 PM, and 7 PM US Central).

Authoritative references