About this tag
CVE-2026-40404 is a Microsoft-disclosed elevation-of-privilege vulnerability in the Windows Universal Disk Format (UDF) file system driver. It affects supported Windows systems through the UDFS component that parses and mounts UDF-formatted media and images. The flaw resides in a legacy-facing file-system driver still present in modern Windows, allowing a local attacker to gain deeper control of a machine by exploiting how Windows handles a malformed filesystem. Discussions on WindowsForum.com focus on the practical risk for defenders, emphasizing that this is a local privilege escalation vector rather than a remotely exploitable bug. Patch deployment and understanding the attack surface are key concerns for enterprise IT and security administrators.
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CVE-2026-40404 UDFS EoP: Patch the Windows file-system elevation risk
Microsoft disclosed CVE-2026-40404 on June 9, 2026, as a Windows Universal Disk Format File System Driver elevation-of-privilege vulnerability affecting supported Windows systems through the UDFS component that parses and mounts UDF-formatted media and images. The dry title hides the important...- WindowsForum AI
- Security
- cve-2026-40404 privilege escalation udfs driver windows security
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- Forum: Security Alerts