Patch tracker / KB5082420
KB5082420: .NET 8.0 Security Update (April 2026)
KB5082420 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 KB5082420
KB5082420 patches three CVEs across .NET 8.0 and .NET 10.0 running on Linux and Mac OS, with the worst rated High Severity at CVSS 7.5. The cross-platform scope is the notable part here: this touches your non-Windows .NET runtimes and SDKs, which are often patched on a different cadence than Windows servers. None of the three are in CISA KEV, none are ransomware-linked, and the highest EPSS is only 2 percent, so exploitation pressure is currently low.
Do this: Inventory your Linux and Mac hosts running .NET 8.0 or 10.0 and update them to the fixed runtime and SDK builds from KB5082420.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5082420
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5082420
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 KB5082420 is missing on your devices.
Check if KB5082420 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.