Patch tracker / KB5101008
KB5101008: .NET Framework 3.5 and 4.8 Security Update (July 2026)
KB5101008 is a High security update for .NET Framework 3.5 and 4.8, released 2026-07-14. It closes 17 CVEs with a maximum CVSS of 8.1. It is the 19th largest of the 61 updates Microsoft shipped that month, by CVEs closed.
Update summary
Fixes 17 CVEs. Most severe CVSS 8.1 (High). EPSS exploit probability up to 4.0%. Among the top half of tracked Microsoft updates by EPSS exploit probability.
A newer security update for Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for x64-based Systems has shipped since this one: KB5120703 (2026-08-11). 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 documents 1 known issue with this update.
- Microsoft is not currently aware of any issues in this update.
KB5101008 is a Security Update bundling .NET Framework 3.5 and 4.8 fixes for Windows 10 version 1809 (32-bit, ARM64, x64) and Windows Server 2019. Any server or workstation still on the 1809 branch that runs managed .NET applications is exposed. The specific CVE detail is still provisional because Microsoft has not published per-update entries for the July 2026 cycle, so the exact vulnerabilities patched here are not yet enumerated.
Do this: Approve KB5101008 for your Windows 10 1809 and Server 2019 systems and stage it in a .NET application test ring before broad deployment.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5101008
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5101008
- Released
- 2026-07-14
- Last changed
- 2026-09-24
- Changes tracked
- 4
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 KB5101008 is installed
Elevated PowerShell. No output means it is not installed.
Known issues, from Microsoft
Quoted from Microsoft's support article for KB5101008 (checked 2026-10-06). Verify against the article before acting.
Microsoft is not currently aware of any issues in this update.
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-2026-47304 | High | 8.1 | 4.9% | No |
| CVE-2026-50646 | High | 7.8 | 4.9% | No |
| CVE-2026-50649 | High | 7.8 | 4.9% | No |
| CVE-2026-50650 | High | 7.8 | 4.9% | No |
| CVE-2026-47302 | High | 7.5 | 4.9% | No |
| CVE-2026-50304 | High | 7.5 | 4.9% | No |
| CVE-2026-50355 | High | 7.5 | 4.9% | No |
| CVE-2026-50368 | High | 7.5 | 4.9% | No |
| CVE-2026-50411 | High | 7.5 | 4.9% | No |
| CVE-2026-50525 | High | 7.5 | 4.9% | No |
| CVE-2026-50527 | High | 7.5 | 4.9% | No |
| CVE-2026-50647 | High | 7.5 | 4.9% | No |
| CVE-2026-50648 | High | 7.5 | 4.9% | No |
| CVE-2026-50652 | High | 7.5 | 4.9% | No |
| CVE-2026-50653 | High | 7.5 | 4.9% | No |
| CVE-2026-50659 | Medium | 6.5 | 4.9% | No |
| CVE-2026-50324 | Medium | 5.9 | 4.9% | No |
Scope and sources
- Affected products
- Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for 32-bit Systems
- Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for ARM64-based Systems
- Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for x64-based Systems
- Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019
- Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019 (Server Core installation)
- Also released in July 2026
KB5099444
186 CVEs · Critical · exploitedKB5099445
175 CVEs · Critical · exploitedKB5099535
262 CVEs · Critical · exploitedKB5099536
390 CVEs · Critical · exploitedKB5099538
313 CVEs · Critical · exploitedKB5099539
315 CVEs · Critical · exploitedKB5099540
327 CVEs · Critical · exploitedKB5101649
384 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.