Patch tracker / CVE reference / CVE-2026-49808

CVE-2026-49808

CVE-2026-49808 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 3 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-2026-49808

CVE-2026-49808 is a Windows Kernel elevation of privilege flaw rated Critical with an unusually high CVSS of 9.9, which is atypical for a local privilege escalation and suggests a low barrier to full system compromise. Exposure spans Windows Server 2025 Server Core plus Windows 11 25H2 on both ARM64 and x64, so both server and client fleets are in scope. It is not in CISA KEV and shows a 7 percent EPSS, so exploitation is not yet observed but the kernel-level impact makes it worth prioritizing.

Do this: Deploy the Microsoft kernel patch for CVE-2026-49808 to Windows Server 2025 Server Core and all Windows 11 25H2 ARM64 and x64 systems in this cycle.

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

Senserva AI Opinion and rich prompt for CVE-2026-49808

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 5%.
Fixed by KB5099536 and 2 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-2026-49808

Moderate priority: schedule it in your normal patch cycle. In Intune or Defender, confirm whether the fixing updates KB5099536, 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-2026-49808. 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.

KB5099536KB5101649KB5101650

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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