Patch tracker / CVE reference / CVE-2026-56168

CVE-2026-56168

CVE-2026-56168 is a Microsoft vulnerability that Microsoft rates Important, with a CVSS score of 6.5 (Medium). 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.

Risk summary

Medium
6.5
CVSS v3
4.9%
EPSS, 30 days
Medium
Severity

Not in the CISA KEV catalog. EPSS exploit probability 4.9%. CVSS 6.5 (Medium).

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

Senserva AI Opinion for CVE-2026-56168

This is an SMB Server denial of service flaw carrying a Medium severity rating with CVSS 6.5, meaning a successful attack disrupts file sharing rather than granting code execution. It hits Windows Server 2022 alongside Windows 10 Version 21H2 in 32-bit and ARM64 flavors, so both file servers and specific client builds are in scope. It is not in CISA KEV and has no known ransomware use, so treat it as an availability risk to patch on your normal cycle rather than an emergency.

Do this: Identify Windows Server 2022 hosts and the affected Windows 10 21H2 32-bit and ARM64 clients with SMB reachable, then schedule the SMB Server patch in your next maintenance window.

AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.

Senserva AI Opinion and rich prompt for CVE-2026-56168

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 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.

Official patch(es) for CVE-2026-56168

Lower priority: patch in your normal 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-2026-56168. 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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