Patch tracker / CVE reference / CVE-2026-41089

CVE-2026-41089

CVE-2026-41089 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 80%. Microsoft has shipped the fix: deploy one of the 9 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Our data comes from Microsoft, CISA and other public sources, and it can be wrong or out of date.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 9 Microsoft security updates.

Senserva AI read on CVE-2026-41089Official patches for CVE-2026-41089Change historyAdmin questions

Risk summary

Critical
9.8
CVSS v3
80%
EPSS, 30 days
Critical
Severity

Not in the CISA KEV catalog. EPSS exploit probability 80%. CVSS 9.8 (Critical).

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

Senserva AI Opinion for CVE-2026-41089

Netlogon Remote Code Execution at Critical Severity (CVSS 9.8) with a 72% EPSS strikes at the most sensitive service in a Windows domain: the one domain controllers use to authenticate the environment. Windows Server 2019 and 2022, including Server Core, are affected. History with Netlogon flaws shows they migrate from disclosure to active domain-takeover exploitation quickly, and the EPSS number says this one is on that track.

Do this: Patch every domain controller running Server 2019 or 2022 before the week is out, then watch Netlogon event logs for anomalous authentication attempts.

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

Patch this cycle
Not confirmed exploited yet, but the 30-day exploit probability is high (EPSS 80%).
Fixed by KB5087423 and 8 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-2026-41089

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

Official patch(es) for CVE-2026-41089

High priority: EPSS puts the odds of near-term exploitation high. In Intune or Defender, confirm whether the fixing updates KB5087423, KB5087424, KB5087470, KB5087471, KB5087537, KB5087538, KB5087539, KB5087541, KB5087545 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-2026-41089. 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.

KB5087423KB5087424KB5087470KB5087471KB5087537KB5087538KB5087539KB5087541KB5087545

Scope and sources

Affected products
Fixed by the same updates
CVE-2026-41096CVE-2026-40402CVE-2026-34329CVE-2026-40403CVE-2026-40415CVE-2026-34332CVE-2026-33834CVE-2026-33835
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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