Patch tracker / KB5048703

KB5048703: Windows Server 2019 Security Update (December 2024)

KB5048703 is a Critical security update for Windows Server 2019, released 2024-12-10. It closes 23 CVEs with a maximum CVSS of 9.8. 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-2024-49084, which FIRST.org rates at 83% probability of exploitation in the next 30 days.

Update summary

CriticalCISA KEV

2024-12-10

Released

CVEs fixed

9.8

Max CVSS

Critical

Severity

Deploy now

This update fixes vulnerabilities confirmed exploited in the wild.

Fixes 23 CVEs. At least one is actively exploited (CISA KEV). Most severe CVSS 9.8 (Critical). EPSS exploit probability up to 83%. Among the top 5% 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.

Senserva found thisread these before you deploy broadly

Microsoft documents 1 known issue with this update.

Microsoft is not currently aware of any issues with this update.

The full text, quoted from Microsoft

Microsoft Update Catalog: download KB5048703 Microsoft support article

Senserva AI Opinion for KB5048703

A narrower December 10, 2024 build, this update fixes 23 CVEs for Windows 10 Version 1809 and Windows Server 2019, still rated up to Critical at CVSS 9.8 with an 84 percent EPSS score and confirmed CISA KEV status. Its smaller CVE count compared to siblings in the same release means it likely targets a specific language pack or edition rather than the full monthly rollup.

Do this: Check whether this 23-CVE build is the correct package for your specific Windows 10 1809 or Server 2019 edition, or if a fuller rollup applies instead.

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

Senserva AI Opinion and rich prompt for KB5048703

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 KB5048703 (source: https://senserva.com/kb/5048703.html, data from MSRC, CISA KEV, FIRST.org EPSS, NVD, refreshed twice a day (5 AM and 3 PM US Central)):
- Update: KB5048703, Windows Server 2019, released 2024-12-10
- Severity: Critical; fixes 23 CVEs, max CVSS 9.8
- Actively exploited (CISA KEV): YES
- CVEs include: CVE-2024-43583, CVE-2024-49072, CVE-2024-49079, CVE-2024-49080, CVE-2024-49082, CVE-2024-49084, CVE-2024-49088, CVE-2024-49089 and 15 more
- Download: https://catalog.update.microsoft.com/Search.aspx?q=KB5048703
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 KB5048703

Released: 2024-12-10
Last changed: 2026-07-19
Changes tracked: 4

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 KB5048703 is installed

Elevated PowerShell. No output means it is not installed.

# Is KB5048703 installed? (elevated PowerShell)
Get-HotFix -Id KB5048703 -ErrorAction SilentlyContinue

# Across many machines (replace the names):
Invoke-Command -ComputerName SERVER01,SERVER02 {
  Get-HotFix -Id KB5048703 -ErrorAction SilentlyContinue
} | Select-Object PSComputerName, HotFixID, InstalledOn

Known issues, from Microsoft

Quoted from Microsoft's support article for KB5048703 (checked 2026-08-10). Verify against the article before acting.

Microsoft is not currently aware of any issues with this update.

How to get this update

EXPIRATION NOTICE

IMPORTANT As of January 27, 2026, this update is no longer available from the Microsoft Update Catalog or other release channels. We recommend that you update your devices to the latest version of Windows.

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-2024-49138	High	7.8	83%	KEV
CVE-2024-49112	Critical	9.8	83%	No
CVE-2024-49080	High	8.8	83%	No
CVE-2024-49102	High	8.8	83%	No
CVE-2024-49104	High	8.8	83%	No
CVE-2024-49105	High	8.4	83%	No
CVE-2024-49118	High	8.1	83%	No
CVE-2024-49122	High	8.1	83%	No
CVE-2024-49124	High	8.1	83%	No
CVE-2024-49126	High	8.1	83%	No
CVE-2024-49127	High	8.1	83%	No
CVE-2024-43583	High	7.8	83%	No
CVE-2024-49072	High	7.8	83%	No
CVE-2024-49079	High	7.8	83%	No
CVE-2024-49088	High	7.8	83%	No
CVE-2024-49090	High	7.8	83%	No
CVE-2024-49096	High	7.5	83%	No
CVE-2024-49113	High	7.5	83%	No
CVE-2024-49121	High	7.5	83%	No
CVE-2024-49107	High	7.3	83%	No
CVE-2024-49089	High	7.2	83%	No
CVE-2024-49084	High	7.0	83%	No
CVE-2024-49082	Medium	6.8	83%	No

Scope and sources

Affected products

Also released in December 2024

Authoritative references

Official KB5048703 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.

KB5048703: Windows Server 2019 Security Update (December 2024)

Update summary

Full tracking and change history for KB5048703

Check if KB5048703 is installed

Known issues, from Microsoft

CVEs fixed by this update

Scope and sources

KB5048652

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KB5048676

KB5048685