Patch tracker / KB5078740
KB5078740: Windows 10 Version 1809 for 32-bit Sys Security Update (March 2026)
KB5078740 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.
KB5078740 is a March 2026 rollup patching 39 CVEs across Windows 11 26H1 (ARM64 and x64) and Windows 10 1809, with the worst rated High at CVSS 8.8. None are in CISA KEV or linked to ransomware, and the highest EPSS is only 4%, so this is a volume patch rather than an emergency. The unusual part is the mixed footprint spanning both a brand new 26H1 branch and the aging 1809 servicing line, so admins running that spread will touch very different fleets from one KB.
Do this: Stage KB5078740 into your standard ring deployment this week, prioritizing the 8.8 CVE-2026-23669 class fix while confirming your 1809 devices are still in a supported servicing channel.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5078740
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5078740
- 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 KB5078740 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.