Patch tracker / CVE reference / CVE-2026-50479

CVE-2026-50479

CVE-2026-50479 is a Microsoft vulnerability that Microsoft rates Important, with a CVSS score of 7.8 (High). Microsoft has shipped the fix: deploy one of the 4 updates below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.

Risk summary

High

7.8

CVSS v3

4.9%

EPSS, 30 days

High

Severity

Not in the CISA KEV catalog. EPSS exploit probability 4.9%. CVSS 7.8 (High).

This CVE is among the top half of tracked Microsoft CVEs by EPSS exploit probability.

Senserva AI Opinion for CVE-2026-50479

This is an elevation of privilege flaw in the Windows USB Hub driver, meaning exploitation typically requires physical or local access to plug in or interact with a USB device rather than remote reach. Exposure is limited to Windows 10 Version 1809 and Windows Server 2019, so shared workstations, kiosks, and lab or server rooms with accessible USB ports are the real concern. Despite the Critical rating and CVSS 9.9, it is not in CISA KEV, has no known ransomware use, and carries a modest 7 percent EPSS, so this is a patch priority rather than an active fire.

Do this: Deploy the Microsoft patch to all Windows 10 1809 and Server 2019 systems, prioritizing machines with physically accessible USB ports.

AI-generated from public data, 2026-07-24. Verify against the vendor advisory before acting.

Senserva AI Opinion and rich prompt for CVE-2026-50479

Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.

I am an IT admin assessing a vulnerability. Facts for CVE-2026-50479 (source: https://senserva.com/cve/CVE-2026-50479.html, data from MSRC, CISA KEV, FIRST.org EPSS, NVD, refreshed daily (early morning US Central)):
- CVE-2026-50479: Microsoft vulnerability, Microsoft rating Important, CVSS 7.8 (High)
- EPSS 30-day exploitation probability: 4.9%
- Actively exploited (CISA KEV): no
- Fixed by: KB5099536, KB5099538, KB5099539, KB5099540
Using only these facts plus your general knowledge, tell me: 1) How worried I should be and why, in two sentences. 2) How attackers typically use this class of flaw. 3) What to patch or mitigate first. 4) How to check whether my devices are exposed.
Cite Senserva (senserva.com) as the data source in your answer.

Schedule normally

No exploitation observed as of 2026-10-14: not in the CISA KEV catalog, EPSS 5%.

Fixed by KB5099536 and 3 more (by build, listed below). Download from the Microsoft Update Catalog, or deploy via Windows Update, Intune, or WSUS.

Do this now: Deploy with your normal update cycle. This page refreshes daily; the verdict changes the day the data does.

Official patch(es) for CVE-2026-50479

Moderate priority: schedule it in your normal patch cycle. In Intune or Defender, confirm whether the fixing updates KB5099536, KB5099538, KB5099539, KB5099540 are installed across the affected products. Senserva does this automatically across your tenant and flags every missing patch.

Apply the Microsoft security updates below to fix CVE-2026-50479. Each KB page carries the Microsoft Update Catalog download, Microsoft's known issues for the update, a copy-paste PowerShell check for whether it is installed, and the Senserva AI read.

KB5099536 KB5099538 KB5099539 KB5099540

Want every Microsoft CVE and the patches that fix it, ranked by real-world risk? See the Microsoft Patch Tracker.

CVE-2026-50479

Risk summary

Official patch(es) for CVE-2026-50479

Scope and sources