Patch tracker / KB5104033
KB5104033: .NET 9.0 installed Security Update (July 2026)
KB5104033 is a High security update for .NET 9.0 installed, released 2026-07-14. It closes 17 CVEs with a maximum CVSS of 8.8. It is the 19th largest of the 61 updates Microsoft shipped that month, by CVEs closed.
Update summary
Fixes 17 CVEs. Most severe CVSS 8.8 (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 .NET 9.0 installed on Linux has shipped since this one: KB5130035 (2026-10-13). 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.
KB5104033 is a Security Update for .NET 9.0 across Linux, Mac OS, and Windows installs, which makes it relevant to cross-platform application servers and build agents rather than just Windows desktops. It arrived in the July 2026 Patch Tuesday cycle, and Microsoft has not yet published the per-update CVE detail, so the specific fixes remain provisional from the MSRC release document. No named zero-days map to this update in that document.
Do this: Inventory your Linux, Mac, and Windows hosts running .NET 9.0 runtimes or SDKs and stage KB5104033 for deployment while watching MSRC for the pending CVE detail.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5104033
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5104033
- Released
- 2026-07-14
- Last changed
- 2026-09-24
- Changes tracked
- 3
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 KB5104033 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-2026-47300 | High | 8.8 | 4.0% | No |
| CVE-2026-47303 | High | 8.8 | 4.0% | No |
| CVE-2026-50528 | High | 8.2 | 4.0% | No |
| 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-2026-50524 | High | 7.5 | 4.0% | No |
| CVE-2026-50525 | High | 7.5 | 4.9% | No |
| CVE-2026-50527 | High | 7.5 | 4.9% | No |
| CVE-2026-50648 | High | 7.5 | 4.9% | No |
| CVE-2026-50651 | High | 7.5 | 4.0% | No |
| CVE-2026-56170 | High | 7.5 | 4.0% | No |
| CVE-2026-57108 | High | 7.5 | 4.0% | No |
| CVE-2026-50526 | High | 7.0 | 4.0% | No |
| CVE-2026-50659 | Medium | 6.5 | 4.9% | No |
Scope and sources
- Affected products
- 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.