Patch tracker / KB5082420
KB5082420: Microsoft .NET Framework 4.8 on Window Security Update (April 2026)
KB5082420 is a High security update for Microsoft .NET Framework 4.8 on Window, released 2026-04-14. It closes 3 CVEs with a maximum CVSS of 7.5. It is the 17th largest of the 60 updates Microsoft shipped that month, by CVEs closed.
Update summary
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.
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
- Released
- 2026-04-14
- Last changed
- 2026-04-14
- 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 KB5082420 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.
| CVE | Severity | CVSS | EPSS | Exploited |
|---|---|---|---|---|
| CVE-2026-23666 | High | 7.5 | 2.1% | No |
| CVE-2026-33116 | High | 7.5 | 2.3% | No |
| CVE-2026-32226 | Medium | 5.9 | 2.1% | No |
Scope and sources
- Affected products
- Also released in April 2026
KB5082052
115 CVEs · Critical · exploitedKB5082060
121 CVEs · Critical · exploitedKB5082063
124 CVEs · Critical · exploitedKB5082123
107 CVEs · Critical · exploitedKB5082142
116 CVEs · Critical · exploitedKB5082198
87 CVEs · Critical · exploitedKB5082200
107 CVEs · Critical · exploitedKB5083768
119 CVEs · Critical · exploitedThe full month, summarized: Microsoft Patch Tuesday.
- Authoritative references
See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.