Patch tracker / CVE reference / CVE-2026-41089

CVE-2026-41089

Updated July 21, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.

Patch this cycle
Not confirmed exploited yet, but the 30-day exploit probability is high (EPSS 72%).
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.

Critical severity Microsoft vulnerability, CVSS 9.8. Fixed by 9 Microsoft security updates.

All about CVE-2026-41089: the Senserva AI read, whether it is exploited, the official patches, its change history, and the questions admins ask.

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

CVE-2026-41089 is a critical severity Microsoft vulnerability with a CVSS score of 9.8. Its EPSS score puts the probability of exploitation in the next 30 days at 72%. 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.

Critical

Risk summary

CVSS base
9.8
EPSS exploit probability
72%
Severity
Critical
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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.

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.

Full tracking and change history for CVE-2026-41089

Published
2026-05-12
Last revised
2026-05-12
Changes tracked
1

Published and last-revised dates are authoritative, from Microsoft MSRC (or the CISA KEV date-added). Senserva additionally records day-to-day changes from 2026-07-07, refreshed several times a day; the change count reflects that forward-only tracking.

Exploitation and severity

Not in the CISA KEV catalog. EPSS exploit probability 72%. CVSS 9.8 (Critical).

This CVE is among the top 25% of tracked Microsoft CVEs by EPSS exploit probability.

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

Affected products

Common questions about CVE-2026-41089

Is CVE-2026-41089 actively exploited?

It is not currently listed in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score puts the probability of exploitation in the next 30 days at 72%.

What patch fixes CVE-2026-41089?

Microsoft fixed CVE-2026-41089 in KB5087423, KB5087424, KB5087470, KB5087471, KB5087537, KB5087538, KB5087539, KB5087541, KB5087545. Download from the Microsoft Update Catalog, or let Intune, Windows Update, or WSUS deliver it.

Which products are affected by CVE-2026-41089?

Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems, Windows 11 Version 25H2 for x64-based Systems, Windows Server 2019, Windows Server 2025 (Server Core installation).

Can I ask my own AI about CVE-2026-41089?

Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2026-41089's key facts: severity, CVSS, EPSS exploit probability, CISA KEV status, and the fixing KB. Copy it into Claude, ChatGPT, or Copilot for a triage plan; the data is refreshed three times a day (5 AM, 12:30 PM, and 7 PM US Central).

Fixed by the same updates

If you are patching CVE-2026-41089, the same updates also fix these:

CVE-2025-54518CVE-2026-21530CVE-2026-32161CVE-2026-32170CVE-2026-32209CVE-2026-33834CVE-2026-33835CVE-2026-33837

Authoritative references

Official CVE record (cve.org)NVD detailMicrosoft MSRCFIRST.org EPSS

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Lexicon: the terms on this page
CVE
Common Vulnerabilities and Exposures. A unique ID for one publicly known vulnerability, such as CVE-2025-1234.
KB
Microsoft Knowledge Base article. The identifier for a specific Microsoft update.
KEV
CISA Known Exploited Vulnerabilities. CVEs confirmed exploited in the wild. Fix these first.
CVSS
Common Vulnerability Scoring System. A standardized Severity score from 0 to 10.
EPSS
Exploit Prediction Scoring System. The probability a CVE will be exploited in the next 30 days.
MSRC
Microsoft Security Response Center. Microsoft's Patch Tuesday advisories and KB-to-CVE mapping.
NVD
National Vulnerability Database (NIST). Authoritative CVE metadata and CVSS scores.
Ransomware
The vulnerability is linked to known ransomware activity.
Reference: Microsoft CVE and vulnerability management, the full CVE-to-patch lookup ranked by real-world risk, and the Microsoft patching guide, how Intune, Windows Autopatch, Defender, and Azure Update Manager fit together.
Data notice: this page, the feeds, and the API are provided as is, for informational purposes only, without warranty of any kind. Senserva, LLC does not guarantee the accuracy, completeness, or timeliness of third-party data (MSRC, NVD, CISA KEV, EPSS) and accepts no liability for actions taken based on it; verify against the authoritative vendor advisory before acting. Built daily with Senserva Trustworthy AI. All use of this data is subject to the Senserva EULA.