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68 CVEs Uncovered in MCP Servers as 91.8% Lack OAuth Authentication, Exposing AI Agent Tool Layers

Security firm Adversa AI disclosed 68 reportable vulnerabilities across audited MCP servers in its September 2026 report, linking some findings to the Deadbugz campaign. The AI Governance Institute described the issues as a systemic gap rather than isolated incidents. Key problems include SQL injection, SSRF targeting cloud metadata endpoints, prompt template injection, and path traversal, each capable of leaking data or hijacking AI agents. Research also showed that 91.8% of examined MCP servers had no OAuth controls, allowing untrusted tool outputs to inject instructions into AI context. Cloud Security Alliance updated its guidelines on September 10 to mandate OAuth 2.1 with PKCE and server metadata validation before any connections. Organizations are urged to inventory MCP assets, apply network isolation, and integrate them into existing CVE and compliance processes.