Patch tracker / CVE reference / CVE-2026-47291

CVE-2026-47291

CVE-2026-47291 is a Microsoft vulnerability that Microsoft rates Critical, with a CVSS score of 9.8 (Critical). Its EPSS score puts the probability of exploitation in the next 30 days at 25%. 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Our data comes from Microsoft, CISA and other public sources, and it can be wrong or out of date.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 Critical. CVSS 9.8 (Critical). Fixed by 10 Microsoft security updates.

Senserva AI read on CVE-2026-47291Official patches for CVE-2026-47291Change historyAdmin questions

Risk summary

Critical
9.8
CVSS v3
25%
EPSS, 30 days
Critical
Severity

Not in the CISA KEV catalog. EPSS exploit probability 25%. CVSS 9.8 (Critical).

This CVE is among the top 5% of tracked Microsoft CVEs by EPSS exploit probability.

Senserva AI Opinion for CVE-2026-47291

CVE-2026-47291 is a Critical (CVSS 9.8) remote code execution flaw in HTTP.sys, the kernel-mode driver that handles HTTP requests on Windows 10 Version 1809 and Windows Server 2019. Because HTTP.sys sits in the kernel and often listens on network-facing ports, exploitation could grant SYSTEM-level code execution without authentication. It is not in CISA KEV yet, but a 54 percent EPSS score signals a meaningful near-term likelihood of exploit development.

Do this: Apply the Microsoft patch to all 1809 and Server 2019 hosts running IIS, WinRM, or other HTTP.sys listeners, prioritizing internet-exposed systems.

AI-generated from public data, 2026-07-26. Verify against the vendor advisory before acting.

Patch this cycle
Not confirmed exploited yet, but the 30-day exploit probability is high (EPSS 25%).
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: Patch in this maintenance window; do not let it slip to the next one.
Senserva AI Opinion and rich prompt for CVE-2026-47291

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From the Senserva blog

Official patch(es) for CVE-2026-47291

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-2026-47291. 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-2026-42904CVE-2025-10263CVE-2026-40402CVE-2026-45602
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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