Patch tracker / KB5078938

KB5078938: Windows Server 2019 Security Update (March 2026)

KB5078938 is a High security update for Windows Server 2019, released 2026-03-10. It closes 35 CVEs with a maximum CVSS of 8.8. It is the 11th largest of the 38 updates Microsoft shipped that month, by CVEs closed.

Update summary

High

2026-03-10

Released

CVEs fixed

8.8

Max CVSS

High

Severity

Deploy this cycle

Fixes 35 CVEs for Windows Server 2019. No confirmed in-the-wild exploitation in this set today.

Fixes 35 CVEs. Most severe CVSS 8.8 (High). EPSS exploit probability up to 4.7%. Among the top 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.

Microsoft Update Catalog: download KB5078938 Microsoft support article

Senserva AI Opinion for KB5078938

KB5078938 is the March 2026 rollup for Windows 10 1809 and Windows Server 2019, closing 35 CVEs with a highest rating of High (CVSS 8.8). None are on the CISA KEV list or linked to ransomware, and exploit probability is low at 4% EPSS, so this is a patch-before-it-matters release rather than an active fire. Server 2019 fleets and any lingering 1809 clients are the exposed population.

Do this: Schedule KB5078938 into your next patch ring for all Server 2019 and Windows 10 1809 hosts, prioritizing the domain-facing servers.

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

Senserva AI Opinion and rich prompt for KB5078938

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

I am an IT admin triaging Microsoft updates. Facts for KB5078938 (source: https://senserva.com/kb/5078938.html, data from MSRC, CISA KEV, FIRST.org EPSS, NVD, refreshed twice a day (5 AM and 3 PM US Central)):
- Update: KB5078938, Windows Server 2019, released 2026-03-10
- Severity: High; fixes 35 CVEs, max CVSS 8.8
- Actively exploited (CISA KEV): no
- CVEs include: CVE-2026-23668, CVE-2026-23669, CVE-2026-23671, CVE-2026-23672, CVE-2026-23673, CVE-2026-23674, CVE-2026-24282, CVE-2026-24285 and 27 more
- Download: https://catalog.update.microsoft.com/Search.aspx?q=KB5078938
Using only these facts plus your general knowledge, tell me: 1) How urgent this update is and why, in two sentences. 2) Which systems should get it first. 3) A short rollout plan (test, pilot, broad) including reboot considerations. 4) What to verify after deployment.
Cite Senserva (senserva.com) as the data source in your answer.

Full tracking and change history for KB5078938

Released: 2026-03-10
Last changed: 2026-07-24
Changes tracked: 2

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 KB5078938 is installed

Elevated PowerShell. No output means it is not installed.

# Is KB5078938 installed? (elevated PowerShell)
Get-HotFix -Id KB5078938 -ErrorAction SilentlyContinue

# Across many machines (replace the names):
Invoke-Command -ComputerName SERVER01,SERVER02 {
  Get-HotFix -Id KB5078938 -ErrorAction SilentlyContinue
} | Select-Object PSComputerName, HotFixID, InstalledOn

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-2026-23668	High	8.8	4.7%	No
CVE-2026-23669	High	8.8	4.7%	No
CVE-2026-23671	High	8.8	4.7%	No
CVE-2026-23672	High	8.8	4.7%	No
CVE-2026-23673	High	8.8	4.7%	No
CVE-2026-23674	High	8.8	4.7%	No
CVE-2026-24282	High	8.8	4.7%	No
CVE-2026-24285	High	8.8	4.7%	No
CVE-2026-24289	High	8.8	4.7%	No
CVE-2026-24291	High	8.8	4.7%	No
CVE-2026-24294	High	8.8	4.7%	No
CVE-2026-24295	High	8.8	4.7%	No
CVE-2026-24296	High	8.8	4.7%	No
CVE-2026-24297	High	8.8	4.7%	No
CVE-2026-25165	High	8.8	4.7%	No
CVE-2026-25168	High	8.8	4.7%	No
CVE-2026-25169	High	8.8	4.7%	No
CVE-2026-25171	High	8.8	4.7%	No
CVE-2026-25172	High	8.8	4.7%	No
CVE-2026-25173	High	8.8	4.7%	No
CVE-2026-25174	High	8.8	4.7%	No
CVE-2026-25175	High	8.8	4.7%	No
CVE-2026-25176	High	8.8	4.7%	No
CVE-2026-25177	High	8.8	4.7%	No
CVE-2026-25178	High	8.8	4.7%	No
CVE-2026-25179	High	8.8	4.7%	No
CVE-2026-25180	High	8.8	4.7%	No
CVE-2026-25181	High	8.8	4.7%	No
CVE-2026-25185	High	8.8	4.7%	No
CVE-2026-25186	High	8.8	4.7%	No
CVE-2026-25187	High	8.8	4.7%	No
CVE-2026-25188	High	8.8	4.7%	No
CVE-2026-25190	High	8.8	4.7%	No
CVE-2026-26111	High	8.8	4.7%	No
CVE-2026-26128	High	8.8	4.7%	No

Scope and sources

Affected products

Also released in March 2026

Authoritative references

Official KB5078938 page (Microsoft Support)Microsoft Update Catalog Microsoft Security Update Guide

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

KB5078938: Windows Server 2019 Security Update (March 2026)

Update summary

Full tracking and change history for KB5078938

Check if KB5078938 is installed

CVEs fixed by this update

Scope and sources

KB5002843

KB5002845

KB5002850

KB5077464

KB5077465

KB5077466

KB5077468

KB5077469