Patch tracker / CVE reference / CVE-2026-54124

CVE-2026-54124

CVE-2026-54124 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 5 updates below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.

Our data comes from Microsoft, CISA and other public sources, and it can be wrong or out of date. If you are unsure, check the linked source before you act, and tell us when we are wrong so we can fix it.

Microsoft rates it Important. CVSS 7.8 (High). Fixed by 5 Microsoft security updates.

Senserva AI read on CVE-2026-54124Official patches for CVE-2026-54124Change historyAdmin questions

Risk summary

High
7.8
CVSS v3
<1%
EPSS, 30 days
High
Severity

Not in the CISA KEV catalog. EPSS exploit probability <1%. CVSS 7.8 (High).

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

Senserva AI Opinion for CVE-2026-54124

CVE-2026-54124 is a Critical (CVSS 9.9) remote code execution flaw in Windows Terminal spanning Windows Server 2022 and Windows 10 Version 21H2 on 32-bit and ARM64 systems, an unusually broad architecture spread for a single Terminal defect. The 9.9 score points to code execution with minimal barriers, though EPSS sits at 7 percent and there is no confirmed exploitation in CISA KEV or ransomware campaigns yet. The mix of server and client editions means both administrative jump boxes and endpoint fleets running Terminal are in scope.

Do this: Inventory Windows Terminal installs across your Server 2022 and Windows 10 21H2 (32-bit and ARM64) systems and apply Microsoft's patch, prioritizing administrative hosts.

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

Schedule normally
No exploitation observed as of 2026-11-03: not in the CISA KEV catalog, EPSS under 1%.
Fixed by KB5099536 and 4 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.
Senserva AI Opinion and rich prompt for CVE-2026-54124

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

Official patch(es) for CVE-2026-54124

Moderate priority: schedule it in your normal patch cycle. In Intune or Defender, confirm whether the fixing updates KB5099536, KB5099539, KB5099540, KB5101649, KB5101650 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-2026-54124. 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.

KB5099536KB5099539KB5099540KB5101649KB5101650

Scope and sources

Affected products
Fixed by the same updates
CVE-2026-56155CVE-2026-32202CVE-2026-57092CVE-2026-42990CVE-2026-49172CVE-2026-50447CVE-2026-50518CVE-2026-54990
Authoritative references
Official CVE record (cve.org)NVD detailMicrosoft MSRCFIRST.org EPSS

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

New to a term on this page? CVE, KB, KEV, CVSS, and EPSS are each explained once, on the Senserva security lexicon. Reference: Microsoft CVE and vulnerability management and the Microsoft patching guide.
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