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CVE-2024-49093: Windows Resilient File System (ReFS) Elevation of Privilege Vulnerability

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-12-10 · updated 2026-06-17
• Weakness: CWE-681

Description

Windows Resilient File System (ReFS) Elevation of Privilege Vulnerability

Affected products

• Microsoft Windows 11: before 10.0.26100.2605 — fixed in 10.0.26100.2605
• Microsoft Windows Server 2025: before 10.0.26100.2605 — fixed in 10.0.26100.2605
• Microsoft Windows 11: from 10.0.26100.0 before 10.0.26100.2605 — fixed in 10.0.26100.2605
• Microsoft Windows Server 2025: from 10.0.26100.0 before 10.0.26100.2605 — fixed in 10.0.26100.2605

How to fix

Upgrade to a fixed version: Microsoft Windows 11 10.0.26100.2605; Microsoft Windows Server 2025 10.0.26100.2605; Microsoft Windows 11 10.0.26100.2605; Microsoft Windows Server 2025 10.0.26100.2605. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-49093

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