Patch tracker / KB5048794
KB5048794: Windows Server 2019 Security Update (December 2024)
KB5048794 is a Critical security update for Windows Server 2019, released 2024-12-10. It closes 58 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-2024-49073, which FIRST.org rates at 83% probability of exploitation in the next 30 days.
Update summary
Fixes 58 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.
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.
We checked Microsoft's support article for KB5048794 on 2026-08-12 and it lists no known issues. Read the article before broad deployment; Microsoft adds issues as reports come in, and we re-check on every refresh.
KB5048794 is the December 10, 2024 rollup for Windows 10 version 1809 and Windows Server 2019, addressing 58 CVEs. The standout is a Critical flaw rated CVSS 9.8 with an 83 percent EPSS score, and at least one CVE in this batch is on the CISA KEV list, meaning it is confirmed exploited in the wild. The KEV listing shows attacks are already happening even though none are tied to ransomware yet.
Do this: Deploy KB5048794 to all Windows 10 1809 and Server 2019 systems now, prioritizing the KEV-listed CVE given active exploitation.
AI-generated from public data, 2026-07-24. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5048794
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5048794
- 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 KB5048794 is installed
Elevated PowerShell. No output means it is not installed.
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.
Scope and sources
- Affected products
- Also released in December 2024
KB5048652
46 CVEs · Critical · exploitedKB5048653
56 CVEs · Critical · exploitedKB5048654
41 CVEs · Critical · exploitedKB5048661
55 CVEs · Critical · exploitedKB5048667
57 CVEs · Critical · exploitedKB5048671
32 CVEs · Critical · exploitedKB5048676
24 CVEs · Critical · exploitedKB5048685
46 CVEs · Critical · exploitedThe full month, summarized: Microsoft Patch Tuesday.
- Authoritative references
See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.