Patch tracker / KB5040438
KB5040438: Windows 11 Version 22H2 for x64-based Security Update (September 2024)
KB5040438 is a High security update for Windows 11 Version 22H2 for x64-based , released 2024-09-10. It closes 1 CVE with a maximum CVSS of 7.3. Get it from the Microsoft Update Catalog below, and see where it sits against the rest of the month on the patch tracker.
Update summary
New to these terms? How the Microsoft patching tools fit together, this month's Patch Tuesday summary, and every update ranked by real-world risk.
Senserva AI Opinion for KB5040438
KB5040438 is a September 2024 companion update for Windows 11 22H2 and 23H2, fixing six of the same batch of CVEs covered by that month's larger release, topped by High severity CVSS 7.8. It applies across both ARM64 and x64 builds, and while none of the six is in CISA KEV or tied to ransomware today, six distinct flaws in one update is enough surface to prioritize over optional patches. Endpoints on 22H2 or 23H2 that skip this stay exposed to all six.
Do this: Include KB5040438 in the current Windows 11 22H2/23H2 rollout alongside other September 2024 updates.
AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5040438
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5040438
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.
Exploitation and severity
Fixes 1 CVE. Most severe CVSS 7.3 (High). EPSS exploit probability up to <1%.
Among the lower half of tracked Microsoft updates by EPSS exploit probability.
What to do
Moderate priority: schedule it in your normal patch cycle. Senserva flags whether KB5040438 is missing on your devices.
Check if KB5040438 is installed
Copy-paste PowerShell: one machine, or your whole estate in one pass. No output means the update is not installed.
Get-HotFix covers Windows updates. Office, SharePoint, and Exchange server updates show under installed updates in Programs and Features, or check the Update Catalog history.
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.
| CVE | Severity | CVSS | EPSS | Exploited |
|---|---|---|---|---|
| CVE-2024-43495 | High | 7.3 | <1% | No |
Affected products
Also released in September 2024
The highest-risk updates from the same release:
The full month, summarized: Microsoft Patch Tuesday.
Authoritative references
See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.