CVE-2026-85343

7.8High

Published 13 Oct 2026 · NVD status: Undergoing Analysis · AI triage by gemini-3.8-flash

7.8High

Attack vector: Local
Complexity: Low
Privileges needed: Low
User interaction: None
Impact: Full C/I/A compromise
Weakness: CWE-59

Impact

A local attacker with standard user privileges can elevate to SYSTEM on the host. They need local access or authenticated code execution on the Windows Hyper-V host machine.

Root cause

Improper link resolution (CWE-59) in Windows Hyper-V allows unauthorized file operations via insecure symlink or junction following.

Affected systems

Versions not listed — check the vendor advisory.

CVSS v3.1 · CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Fix & remediation

Install the relevant Microsoft security update for Windows Hyper-V referencing CVE-2026-85343; no interim workaround is currently provided.

AI-suggested. Run it in staging first and check it against the vendor advisory. Why?

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NVD description

Improper link resolution before file access ('link following') in Windows Hyper-V allows an authorized attacker to elevate privileges locally.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85343

Source: nvd.nist.gov/vuln/detail/CVE-2026-85343