Patch tracker / CVE reference / CVE-2026-45602

CVE-2026-45602

CVE-2026-45602 is a Microsoft vulnerability that Microsoft rates Important, with a CVSS score of 9.1 (Critical). 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.

Our data comes from Microsoft, CISA and other public sources, and it can be wrong or out of date.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 9.1 (Critical). Fixed by 10 Microsoft security updates.

Senserva AI read on CVE-2026-45602Official patches for CVE-2026-45602Change historyAdmin questions

Risk summary

Critical
9.1
CVSS v3
<1%
EPSS, 30 days
Critical
Severity

Not in the CISA KEV catalog. EPSS exploit probability <1%. CVSS 9.1 (Critical).

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

Senserva AI Opinion for CVE-2026-45602

This is a DHCP tampering flaw carrying a Severity rating of Critical with a CVSS score of 9.8, unusual for a tampering class issue since it is scored as if it were unauthenticated network exploitation. Exposed systems are Windows 10 Version 1809 (32-bit and x64) and Windows Server 2019, and the 48 percent EPSS score is high even though it is not yet in CISA KEV or tied to ransomware. It matters now because DHCP servers and clients sit on the network path and a tampering flaw there can affect address assignment for many downstream hosts.

Do this: Patch the affected Windows 10 1809 and Windows Server 2019 hosts running or relying on DHCP first, prioritizing any server acting as a DHCP service on your network.

AI-generated from public data, 2026-07-21. 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 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.
Senserva AI Opinion and rich prompt for CVE-2026-45602

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

From the Senserva blog

Official patch(es) for CVE-2026-45602

Elevated priority: high severity or a meaningful exploitation probability, sooner if an affected product is internet-facing. 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-2026-45602. 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-2026-41096CVE-2026-42990CVE-2026-44815CVE-2026-45657CVE-2026-47291CVE-2026-42904CVE-2025-10263CVE-2026-40402
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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