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CVE-2026-40381 Azure Connected Machine Agent Elevation of Privilege Vulnerability

An elevation of privilege vulnerability (CVE-2026-40381, CVSS 7.8) in the Azure Connected Machine Agent stems from improper access control (CWE-284). An authenticated local attacker can exploit this by interfering with the ArcProxy service's local port and responding with crafted authentication data to access sensitive files from a higher-privileged account. Microsoft has released a security update for the agent; users should apply the patch referenced in the associated Microsoft Security Update Guide.
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