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Windows Container Isolation EUVDEUVD-2026-56603

| CVE-2026-72971 MEDIUM
Improper Link Resolution Before File Access (CWE-59)
2026-08-11 secure@microsoft.com GHSA-mq4h-r45f-27gp
5.5
CVSS 3.1 · Vendor: microsoft
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Severity by source

Vendor (microsoft) PRIMARY
5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
vuln.today AI
5.5 MEDIUM

Local-only attack requiring a low-privilege session to plant symlinks; no confidentiality loss, no scope change, pure integrity impact on the vulnerable system.

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (microsoft).

CVSS VectorVendor: microsoft

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

Lifecycle Timeline

3
Analysis Generated
Aug 11, 2026 - 22:02 vuln.today
Patch available
Aug 11, 2026 - 18:19 EUVD
CVE Published
Aug 11, 2026 - 17:19 cve.org
MEDIUM 5.5

DescriptionCVE.org

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.

AnalysisAI

Symlink-following in the Windows Container Isolation FS Filter Driver (unionfs.sys) enables a locally authenticated attacker with low privileges to tamper with files outside the expected isolation boundary. Affected systems run Windows 11 version 26H1 builds prior to 10.0.28000.2704. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Exploit
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Execution
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Persist
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Impact
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Vulnerability AssessmentAI

Exploitation Exploitation requires a locally authenticated session with at least low-privilege (standard user) rights on the target Windows 11 26H1 system. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 base score of 5.5 (AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N) accurately reflects a moderate local tampering risk: attack complexity is low, but exploitation is confined to the local machine and requires at least a low-privilege authenticated session. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Apply the vendor-released patch that brings Windows 11 26H1 to build 10.0.28000.2704 or later via Windows Update or WSUS; this is the only confirmed fix per EUVD-2026-56603 and the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-72971. … Detailed patch versions, workarounds, and compensating controls in full report.

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EUVD-2026-56603 vulnerability details – vuln.today

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