Patch tracker / KB5075942

KB5075942: Windows Server 2019 Security Update (February 2026)

KB5075942 is a High security update for Windows Server 2019, released 2026-02-10. It closes 29 CVEs with a maximum CVSS of 8.8. At least one of them is actively exploited (CISA KEV), so this is a deploy-first update. The most likely of them to be attacked is CVE-2026-21519, which FIRST.org rates at 26% probability of exploitation in the next 30 days.

Update summary

HighCISA KEV

2026-02-10

Released

CVEs fixed

8.8

Max CVSS

High

Severity

Deploy now

This update fixes vulnerabilities confirmed exploited in the wild.

Fixes 29 CVEs. At least one is actively exploited (CISA KEV). Most severe CVSS 8.8 (High). EPSS exploit probability up to 26%. Among the top 25% 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: KB5094041 (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 KB5075942 Microsoft support article

Senserva AI Opinion for KB5075942

KB5075942 is the February 10, 2026 rollup for Windows 10 version 1809 and Windows Server 2019, closing 29 CVEs including one already listed in the CISA Known Exploited Vulnerabilities catalog. The top issue rates High severity at CVSS 8.8 with an EPSS of 26 percent, and the KEV entry means attacks are confirmed in the wild even though none are tied to ransomware yet. Server 2019 domain controllers and legacy 1809 endpoints are the exposed population here.

Do this: Deploy KB5075942 to your Server 2019 and Windows 10 1809 systems now, prioritizing the internet-facing hosts and the CVE flagged in CISA KEV.

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

Senserva AI Opinion and rich prompt for KB5075942

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 KB5075942 (source: https://senserva.com/kb/5075942.html, data from MSRC, CISA KEV, FIRST.org EPSS, NVD, refreshed twice a day (5 AM and 3 PM US Central)):
- Update: KB5075942, Windows Server 2019, released 2026-02-10
- Severity: High; fixes 29 CVEs, max CVSS 8.8
- Actively exploited (CISA KEV): YES
- CVEs include: CVE-2026-20846, CVE-2026-21222, CVE-2026-21231, CVE-2026-21232, CVE-2026-21234, CVE-2026-21236, CVE-2026-21237, CVE-2026-21238 and 21 more
- Download: https://catalog.update.microsoft.com/Search.aspx?q=KB5075942
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 KB5075942

Released: 2026-02-10
Last changed: 2026-02-10
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 KB5075942 is installed

Elevated PowerShell. No output means it is not installed.

# Is KB5075942 installed? (elevated PowerShell)
Get-HotFix -Id KB5075942 -ErrorAction SilentlyContinue

# Across many machines (replace the names):
Invoke-Command -ComputerName SERVER01,SERVER02 {
  Get-HotFix -Id KB5075942 -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-2026-21510	High	8.8	26%	KEV
CVE-2026-21513	High	8.8	26%	KEV
CVE-2026-21519	High	7.8	26%	KEV
CVE-2026-21533	High	7.8	26%	KEV
CVE-2026-21525	Medium	6.2	26%	KEV
CVE-2026-21249	High	8.8	26%	No
CVE-2026-21255	High	8.8	26%	No
CVE-2026-21231	High	7.8	26%	No
CVE-2026-21232	High	7.8	26%	No
CVE-2026-21236	High	7.8	26%	No
CVE-2026-21238	High	7.8	26%	No
CVE-2026-21239	High	7.8	26%	No
CVE-2026-21240	High	7.8	26%	No
CVE-2026-21245	High	7.8	26%	No
CVE-2026-21246	High	7.8	26%	No
CVE-2026-21250	High	7.8	26%	No
CVE-2026-21251	High	7.8	26%	No
CVE-2026-20846	High	7.5	26%	No
CVE-2026-21243	High	7.5	26%	No
CVE-2026-21244	High	7.3	26%	No
CVE-2026-21247	High	7.3	26%	No
CVE-2026-21248	High	7.3	26%	No
CVE-2026-21234	High	7.0	26%	No
CVE-2026-21237	High	7.0	26%	No
CVE-2026-21241	High	7.0	26%	No
CVE-2026-21242	High	7.0	26%	No
CVE-2026-21253	High	7.0	26%	No
CVE-2026-21508	High	7.0	26%	No
CVE-2026-21222	Medium	5.5	26%	No

Scope and sources

Affected products

Also released in February 2026

Authoritative references

Official KB5075942 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.

KB5075942: Windows Server 2019 Security Update (February 2026)

Update summary

Full tracking and change history for KB5075942

Check if KB5075942 is installed

CVEs fixed by this update

Scope and sources

KB5075897

KB5075899

KB5075904

KB5075906

KB5075912

KB5075941

KB5075943

KB5075970