Patch tracker / CVE reference / CVE-2026-45642

CVE-2026-45642

CVE-2026-45642 is a Microsoft vulnerability that Microsoft rates Important, with a CVSS score of 3.9 (Low). Microsoft has shipped the fix: deploy one of the 10 updates below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.

Risk summary

Low
3.9
CVSS v3
2.6%
EPSS, 30 days
Low
Severity

Not in the CISA KEV catalog. EPSS exploit probability 2.6%. CVSS 3.9 (Low).

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

Senserva AI Opinion for CVE-2026-45642

This spoofing flaw sits in the Azure Attestation and Device Health Attestation services on Windows 10 Version 1809 and Windows Server 2019, and carries a maximum Critical Severity rating of CVSS 9.8. Attestation is what tells you a device or workload is in a trusted state, so a spoof here can let an attacker misrepresent that trust to relying systems. An EPSS score of 48 percent puts it among the more likely of this cycle's issues to see exploit activity even though it is not yet in the CISA KEV catalog.

Do this: Patch Windows Server 2019 and Windows 10 1809 hosts that participate in device attestation or health-based access decisions first.

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

Senserva AI Opinion and rich prompt for CVE-2026-45642

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

Schedule normally
No exploitation observed as of 2026-10-14: not in the CISA KEV catalog, EPSS 3%.
Fixed by KB5093998 and 9 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-2026-45642

Lower priority: patch in your normal cycle. In Intune or Defender, confirm whether the fixing updates KB5093998, KB5094041, KB5094042, KB5094122, KB5094123, KB5094125, KB5094126, KB5094127, KB5094128, KB5095051 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-2026-45642. 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.

KB5093998KB5094041KB5094042KB5094122KB5094123KB5094125KB5094126KB5094127KB5094128KB5095051

Scope and sources

Affected products
Fixed by the same updates
CVE-2025-54518CVE-2026-41096CVE-2026-42990CVE-2026-44815CVE-2026-45657CVE-2026-47291CVE-2026-42904CVE-2025-10263
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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