Patch tracker / KB5084597

KB5084597: Windows 10 Version 1809 for 32-bit Sys Security Update (March 2026)

KB5084597 is a High security update for Windows 10 Version 1809 for 32-bit Sys, released 2026-03-10. It closes 3 CVEs with a maximum CVSS of 8.0. It is the 18th largest of the 38 updates Microsoft shipped that month, by CVEs closed.

Update summary

High
2026-03-10
Released
3
CVEs fixed
8.0
Max CVSS
High
Severity
Deploy this cycle
Fixes 3 CVEs for Windows 10 Version 1809 for 32-bit Sys. No confirmed in-the-wild exploitation in this set today.

Fixes 3 CVEs. Most severe CVSS 8.0 (High). EPSS exploit probability up to <1%. Among the lower half 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 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.

Microsoft Update Catalog: download KB5084597Microsoft support article
Senserva AI Opinion for KB5084597

KB5084597 patches three CVEs across an unusually wide spread of Windows, from legacy Windows 10 Version 1809 (32-bit) through the newer Windows 11 Version 26H1 on both ARM64 and x64. The top issue rates High severity at CVSS 8.0, but exploitation signals are low with EPSS at 1 percent and none of the three CVEs listed in CISA KEV or tied to ransomware. The mixed old and new coverage means both aging endpoints and freshly deployed 26H1 machines need this same rollup.

Do this: Deploy KB5084597 across your Windows 10 1809 and Windows 11 26H1 fleets, prioritizing any still-running 32-bit 1809 systems that are hardest to replace.

AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.

Senserva AI Opinion and rich prompt for KB5084597

Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.

Full tracking and change history for KB5084597

Released
2026-03-10
Last changed
2026-03-10
Changes tracked
1

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 KB5084597 is installed

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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.

CVESeverityCVSSEPSSExploited
CVE-2026-25172High8.84.7%No
CVE-2026-25173High8.84.7%No
CVE-2026-26111High8.84.7%No

Scope and sources

Affected products
Also released in March 2026

KB5002843

3 CVEs · High

KB5002845

4 CVEs · High

KB5002850

4 CVEs · High

KB5077464

2 CVEs · High

KB5077465

2 CVEs · High

KB5077466

3 CVEs · High

KB5077468

3 CVEs · High

KB5077469

2 CVEs · High

The full month, summarized: Microsoft Patch Tuesday.

Authoritative references
Official KB5084597 page (Microsoft Support)Microsoft Update CatalogMicrosoft Security Update Guide

See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.

New to a term on this page? CVE, KB, KEV, CVSS, and EPSS are each explained once, on the Senserva security lexicon. Reference: Microsoft CVE and vulnerability management and the Microsoft patching guide.
Provided as is, without warranty; verify against the vendor advisory before acting. Data notice and terms.