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CVE-2026-49790 Microsoft CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-14T17:16:54.543Z and has not been modified since then. The NVD entry is currently Analyzed. This elevation of privilege vulnerability in the Windows Universal Disk Format File System Driver (UDFS) affects various versions of Windows 10, Windows 11, and Windows Server, allowing an attacker to gain elevated privileges on a system. The Common Vulnerabilities and Exposures (CVE) score for this vulnerability is 7.3, indicating a high severity level. The vulnerability is caused by improper handling of file system operations, which can be exploited by a local attacker to elevate privileges. System administrators and users of Windows operating systems should be aware of this vulnerability and take necessary precautions. Microsoft has provided a vendor advisory and patch for this vulnerability.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 7.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-14
Original CVE updated
2026-07-20
Advisory published
2026-07-14
Advisory updated
2026-07-20

Who should care

System administrators and users of Windows operating systems, particularly those using Windows 10, Windows 11, and Windows Server, should be aware of this elevation of privilege vulnerability in the Windows Universal Disk Format File System Driver (UDFS).

Technical summary

The Windows Universal Disk Format File System Driver (UDFS) Elevation of Privilege Vulnerability, tracked as CVE-2026-49790, allows an attacker to gain elevated privileges on a system. This vulnerability exists in various versions of Windows 10, Windows 11, and Windows Server. The Common Vulnerabilities and Exposures (CVE) score for this vulnerability is 7.3, indicating a high severity level. The vulnerability is caused by improper handling of file system operations, which can be exploited by a local attacker to elevate privileges.

Defensive priority

High priority should be given to patching this vulnerability, especially in environments where local attackers may have access to systems.

Recommended defensive actions

  • Apply the patch provided by Microsoft to fix the vulnerability.
  • Ensure that all Windows operating systems, particularly Windows 10, Windows 11, and Windows Server, are updated with the latest security patches.
  • Implement additional security measures such as restricting local access to sensitive systems and monitoring for suspicious activity.
  • Conduct regular vulnerability assessments and penetration testing to identify and address potential security weaknesses.
  • Consider implementing compensating controls, such as enhanced monitoring and incident response planning, until patches can be applied.

Evidence notes

The CVE record and NVD detail provide information on the vulnerability, its impact, and affected systems. Microsoft has provided a vendor advisory and patch for this vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-49790 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-49790

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-49790 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-49790

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.