Patch tracker / KB5082400
KB5082400: .NET 8.0 Security Update (April 2026)
KB5082400 is a High security update for .NET 8.0, released 2026-04-14. It closes 3 CVEs with a maximum CVSS of 7.5. 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 KB5082400
KB5082400 is a cross platform .NET update covering .NET 10.0 on Mac OS and Linux plus .NET 8.0, patching three CVEs including one rated High severity at CVSS 7.5. Exposure spans your Mac and Linux hosts running .NET 10.0 as well as any systems still on the .NET 8.0 runtime, so this is not a Windows only concern. None of the three CVEs are in the CISA KEV catalog and EPSS peaks at only 2 percent, so the immediate exploitation pressure is low but real given the High severity rating.
Do this: Inventory all Mac OS, Linux, and Windows hosts running .NET 10.0 or .NET 8.0 and schedule KB5082400 deployment starting with internet facing services.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5082400
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5082400
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 3 CVEs. Most severe CVSS 7.5 (High). EPSS exploit probability up to 2.1%.
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 KB5082400 is missing on your devices.
Check if KB5082400 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-2026-23666 | High | 7.5 | 2.1% | No |
| CVE-2026-32226 | High | 7.5 | 2.1% | No |
| CVE-2026-33116 | High | 7.5 | 2.3% | No |
Affected products
Also released in April 2026
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.