PT-2026-47880 · Microsoft · Projected File System

Published 2026-06-09 · Updated 2026-06-10 · CVE-2026-42837

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Windows Projected File System Filter Driver (affected versions not specified)

Description A buffer over-read in the Windows Projected File System (ProjFS) filter driver allows an authorized attacker to perform a local privilege escalation. This issue occurs when the driver reads more data than is available in a buffer, which can be leveraged to gain higher system permissions.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

LPE

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

CVE-2026-42837

Affected Products

Projected File System

References · 3

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42837 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-42837 · Security Note
• https://twitter.com/windowsforum/status/2064528856166342834 · Twitter Post