Patch tracker / KB5097148
KB5097148: .NET 8.0 installed on Windows Security Update (June 2026)
KB5097148 is a High security update for .NET 8.0 installed on Windows, released 2026-06-09. It closes 3 CVEs with a maximum CVSS of 7.8. Get it from the Microsoft Update Catalog below, and see where it sits against the rest of the month on the patch tracker.
Microsoft security update released 2026-06-09. Fixes 3 CVEs.
No exploitation is confirmed for the CVEs in this update and the EPSS exploitation probability is currently 2.4%. That can change: CVEs from past updates regularly get exploited months later, which is why deploying on your normal cadence, without exceptions that linger, is what keeps this one boring.
Most organizations deliver an update like this automatically through Intune update rings, Windows Update for Business, Windows Autopatch, or WSUS; the install section below covers each path. For the bigger picture: how the Microsoft patching tools fit together, this month's Patch Tuesday summary, and every update ranked by real-world risk.
Updated July 25, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.
Download KB5097148
Get the official update for KB5097148. The download and file size for each supported product are on the Microsoft Update Catalog page.
Update summary
Senserva AI Opinion for KB5097148
KB5097148 patches three CVEs across .NET 8.0, 9.0, and 10.0 on Windows, with the most serious rated High Severity at CVSS 7.8. Any server or workstation running applications built on these three .NET runtimes is in scope, which typically spans a broad mix of internal line of business apps and web services. Exploitation likelihood is currently low (EPSS 2 percent, no CISA KEV listing and no ransomware association), so this is a plan and schedule fix rather than an emergency.
Do this: Inventory which hosts run .NET 8.0, 9.0, or 10.0 and roll out KB5097148 during your next maintenance window, prioritizing internet facing app servers.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5097148
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5097148
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 7.8 (High). EPSS exploit probability up to 2.4%.
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 KB5097148 is missing on your devices.
Check if KB5097148 is installed
Copy-paste PowerShell: one machine, or your whole fleet 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.
Writing about KB5097148? Cite this page
Copy-paste for a blog post, forum answer, or internal doc. The link always carries the current risk data.
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-2026-45490 | High | 7.8 | 2.4% | No |
| CVE-2026-45491 | High | 7.8 | 2.4% | No |
| CVE-2026-45591 | High | 7.8 | 2.4% | No |
Affected products
Also released in June 2026
The highest-risk updates from the same release:
The full month, summarized: Microsoft Patch Tuesday.
How to install KB5097148
Any of these paths delivers KB5097148; most organizations already have one of the first three running:
- Intune update rings (Windows Update for Business): the update flows on each ring's deferral schedule.
- Windows Autopatch: rings, rollout, and pause or rollback are managed for you; exploited updates can be expedited.
- WSUS / Configuration Manager: approve KB5097148 for your device groups and set a deadline.
- Manual: download from the Update Catalog above and install; fine for a handful of machines, unmanageable at any real scale.
After the rollout, verify rather than assume: update compliance reporting in Intune or Autopatch shows which devices actually installed it, and Siemserva reads Intune, Defender, Autopatch, and Azure Update Manager together to show the devices still missing KB5097148, ranked by exploitation.
Common questions about KB5097148
Is KB5097148 urgent?
KB5097148 is rated High. Include it in your normal patch cycle unless your environment raises its priority.
How do I download KB5097148?
From the Microsoft Update Catalog (linked on this page), or let Intune, Windows Update for Business, Windows Autopatch, or WSUS deliver it. The catalog page lists the download for each supported product.
How do I deploy KB5097148 with Intune?
Assign a Windows Update ring (quality update policy) to the device groups and the update flows on the ring's deferral schedule. For urgent updates, Intune expedite policies can bypass the ring deferrals. Verify the rollout with update compliance reporting rather than assuming delivery.
Can I ask my own AI about KB5097148?
Yes. This page includes a free, ready-to-paste AI prompt containing KB5097148's key facts: severity, CVE count, exploitation status, and the download link. Copy it into Claude, ChatGPT, or Copilot for a rollout plan; the data is refreshed twice a day (5 AM and 3 PM US Central).
Authoritative references
See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.
