Patch tracker / KB5079473
KB5079473: Windows 10 Version 1809 for 32-bit Sys Security Update (March 2026)
KB5079473 is a High security update for Windows 10 Version 1809 for 32-bit Sys, released 2026-03-10. It closes 41 CVEs with a maximum CVSS of 8.8. It is the second largest of the 38 updates Microsoft shipped that month, by CVEs closed.
Update summary
Fixes 41 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.
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.
KB5079473 is a March 2026 rollup for Windows 10 versions 1809 and 21H2 that closes 41 CVEs, the worst rated High at CVSS 8.8. None are on the CISA KEV list or tied to ransomware, and exploit probability is low at 4% EPSS, so this is a volume patch rather than an emergency. The exposure spans both older 1809 and newer 21H2 fleets, including 32-bit installs that are often overlooked in patch scoping.
Do this: Schedule KB5079473 in your next standard patch cycle and confirm your 32-bit 1809 and 21H2 endpoints are included in the deployment ring.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5079473
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5079473
- 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 KB5079473 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 March 2026
KB5002843
3 CVEs · HighKB5002845
4 CVEs · HighKB5002850
4 CVEs · HighKB5077464
2 CVEs · HighKB5077465
2 CVEs · HighKB5077466
3 CVEs · HighKB5077468
3 CVEs · HighKB5077469
2 CVEs · HighThe full month, summarized: Microsoft Patch Tuesday.
- Authoritative references
See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.