Patch tracker / CVE reference / CVE-2026-40370

CVE-2026-40370

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

Schedule normally
No exploitation observed: not in the CISA KEV catalog, EPSS under 1%.
Fixed by KB5089270 and 9 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.

High severity Microsoft vulnerability, CVSS 8.8. Fixed by 10 Microsoft security updates.

All about CVE-2026-40370: the Senserva AI read, whether it is exploited, the official patches, its change history, and the questions admins ask.

Senserva AI read on CVE-2026-40370Official patches for CVE-2026-40370Change historyAdmin questions

CVE-2026-40370 is a high severity Microsoft vulnerability with a CVSS score of 8.8. 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.

High

Risk summary

CVSS base
8.8
EPSS exploit probability
<1%
Severity
High
SenservaSenserva provides Three Free Unlimited Audits, including all tenants and full Claude MCP.Start my Audit

Senserva AI Opinion for CVE-2026-40370

A Remote Code Execution flaw in Microsoft SQL Server spanning three generations at once: SQL Server 2017 GDR, 2022 CU24, and the new 2025 CU4, rated High Severity (CVSS 8.8). Database engine RCEs put the crown jewels directly in play, since the compromised process already holds your data. The 1% EPSS reflects that SQL Server exploitation usually requires database access first, but plenty of application-layer SQL injection bugs provide exactly that stepping stone.

Do this: Schedule SQL Server patching across all three affected version lines, starting with instances reachable by internet-facing applications.

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

Senserva AI Opinion and rich prompt for CVE-2026-40370

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

Full tracking and change history for CVE-2026-40370

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 <1%. CVSS 8.8 (High).

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

Official patch(es) for CVE-2026-40370

Moderate priority: schedule it in your normal patch cycle. In Intune or Defender, confirm whether the fixing updates KB5089270, KB5089271, KB5089899, KB5089900, KB5090347, KB5090354, KB5090407, KB5090408, KB5091158, KB5091223 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-2026-40370. 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.

KB5089270KB5089271KB5089899KB5089900KB5090347KB5090354KB5090407KB5090408KB5091158KB5091223

Affected products

Common questions about CVE-2026-40370

Is CVE-2026-40370 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 <1%.

What patch fixes CVE-2026-40370?

Microsoft fixed CVE-2026-40370 in KB5089270, KB5089271, KB5089899, KB5089900, KB5090347, KB5090354, KB5090407, KB5090408, KB5091158, KB5091223. Download from the Microsoft Update Catalog, or let Intune, Windows Update, or WSUS deliver it.

Which products are affected by CVE-2026-40370?

Microsoft SQL Server 2017 for x64-based Systems (GDR), Microsoft SQL Server 2022 for x64-based Systems (CU 24), Microsoft SQL Server 2025 for x64-based Systems (CU4).

Can I ask my own AI about CVE-2026-40370?

Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2026-40370'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).

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.

Three Free Unlimited Audits: all users, all settings, all patches, all tenants. All you do is register.

Three free audits, across every tenant you manage: 1 scan to find, 2 to review your fixes. It finds:

Includes our advanced Claude MCP: everything you need to run full audits.

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.