Microsoft MCP Gateway vulnerability CVE-2026-109492 allows an authorized attacker to bypass authorization controls via a user-controlled key, enabling elevation of privileges across a network. This vulnerability affects systems utilizing the MCP Gateway, which is a component of various Microsoft products and services. The issue arises when an attacker can manipulate a user-controlled key, permitting unauthorized access to elevated privileges. This security flaw matters to AI agents and their developers because it compromises the integrity of systems that rely on MCP Gateway, potentially enabling malicious actors to manipulate or disrupt AI-driven operations. Remediation is required to prevent exploitation of this vulnerability, which could have significant consequences for AI systems utilizing the affected software.