Patch tracker / CVE reference / CVE-2026-40369

CVE-2026-40369

Critical severity Microsoft vulnerability, CVSS 9.8. Fixed by 5 Microsoft security updates.

Critical

Risk summary

CVSS base
9.8
EPSS exploit probability
72%
Severity
Critical

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.

What to do

High priority: EPSS puts the odds of near-term exploitation high. In Intune or Defender, confirm whether the fixing updates KB5087423, KB5087539, KB5089466, KB5089548, KB5089549 are installed across the affected products. Senserva does this automatically across your tenant and flags every missing patch.

Official patch for CVE-2026-40369

Apply the Microsoft security updates below to fix CVE-2026-40369. Each KB page links to the Microsoft Update Catalog download for every affected product.

KB5087423KB5087539KB5089466KB5089548KB5089549

Affected products

  • Windows 11 Version 25H2 for ARM64-based Systems
  • Windows 11 Version 25H2 for x64-based Systems
  • Windows Server 2025 (Server Core installation)

Authoritative references

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.

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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.