Patch tracker / KB5078736
KB5078736: Windows 10 Version 1809 for 32-bit Sys Security Update (March 2026)
KB5078736 is a High security update for Windows 10 Version 1809 for 32-bit Sys, released 2026-03-10. It closes 39 CVEs with a maximum CVSS of 8.8. It is the eighth largest of the 38 updates Microsoft shipped that month, by CVEs closed.
Update summary
Fixes 39 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 11 Version 26H1 for ARM64-based Systems has shipped since this one: KB5082126 (2026-04-14). 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.
KB5078736 is a March 2026 rollup fixing 39 CVEs across a wide span of Windows, from legacy Windows 10 Version 1809 (including 32-bit) up to the new Windows 11 Version 26H1 on ARM64 and x64. The top issue rates High Severity at CVSS 8.8, but exploitation likelihood is low so far with a 4 percent EPSS and no CISA KEV or ransomware links. The unusual part is the breadth of affected builds, meaning both aging 1809 endpoints and freshly deployed 26H1 machines need this single update.
Do this: Deploy KB5078736 across all Windows rings this cycle, prioritizing any remaining Windows 10 Version 1809 32-bit hosts that often lag in patch coverage.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5078736
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5078736
- 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 KB5078736 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.