Threat · curated 19 Aug 2026
CVE Record: CVE-2026-75845
First reported cve.org
Coverage timeline
Single-source advisory — first reported, latest, and curated coincide.
Why it matters
CVE-2026-75845 shows how an MCP-exposed tool with insufficient role checks lets low-privileged users tamper with server configuration, a concrete example of function-calling/tool-abuse risk defenders must patch in agentic deployments.
CVE-2026-75845 is an authorization bypass in ArcadeDB versions 26.4.2 through 26.7.3 affecting the set_server_setting MCP server-level tool. SetServerSettingTool.execute() checks only the global allowAdmin flag without verifying the caller's role, so in an MCP deployment with allowAdmin=true and a non-root allowedUsers set, any authenticated read-only user can invoke set_server_setting to modify server GlobalConfiguration, enabling configuration tampering or denial of service. The issue is fixed in 26.8.1.