MicrosoftCVE-2026-72971

Microsoft Windows 11 version 26H1: tampering

CVE-2026-72971 · Published Aug 11, 2026 · updated Aug 14, 2026

Medium5.5

Fix: upgrade to 10.0.28000.2704 or later

Improper link resolution before file access ('link following') in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to perform tampering locally.

Affected versions

Package	Affected	Fixed in
Windows 11 version 26H1 Product	>= 10.0.28000.0, < 10.0.28000.2704	10.0.28000.2704

Details and references

CVSS 3.1: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Severity from: the vendor (its own CVE record or advisory)
Weakness: CWE-59

More Microsoft advisories

All Microsoft

High 7.1Aug 11

Copilot Chat Security Feature Bypass VulnerabilityCVE-2026-65675fixed in 1.132.1 High 7.8Aug 11

Copilot Custom Agent Hook Remote Code Execution VulnerabilityCVE-2026-70335fixed in 1.132.1 MediumAug 11

Information disclosure vulnerabilityCVE-2026-47285fixed in 1.132.1 High 8.8Aug 11

Fileless RCE in VS Code Web Remote Terminal via URL-Controlled NODE_OPTIONSCVE-2026-70336fixed in 1.132.1 High 8.8Aug 11

Visual Studio Code web deployments - environmentService.ts - RCE via NODE_OPTIONS --import from URL payloadCVE-2026-69320fixed in 1.132.1 High 7.8Aug 11

TerminalInstance._createProcess - Workspace Trust bypass via terminal waitOnExitCVE-2026-69278fixed in 1.132.1