Critical Microsoft Azure AI Foundry Vulnerability Allows Attackers to Escalate Privileges

Microsoft has patched a maximum-severity security flaw in Azure AI Foundry, its enterprise platform for building and managing generative AI applications and agents, that could have allowed an unauthenticated attacker to escalate privileges over the network without any user interaction. Tracked as CVE-2026-85889, the vulnerability carries the highest possible CVSS score of 10.0, placing it among the most severe cloud security issues disclosed this year. According to Microsoft’s advisory, published on September 17, 2026, the root cause is a missing authentication check for a critical function within Azure AI Foundry, classified under CWE-306. This flaw meant an attacker with no valid credentials could reach and abuse a...

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