CVE-2026-54547: meta-ads-mcp: X-Pipeboard-Token Header Auth Bypass Reuses Operator Meta Token

AuthInjectionMiddleware in meta-ads-mcp rejects HTTP MCP requests only when both auth_token and pipeboard_token are absent. Because extract_token_from_headers() does not recognise the X-Pipeboard-Token header, an attacker who sends that header with any arbitrary value produces auth_token = None and pipeboard_token = <attacker value>, making the guard condition evaluate to False and passing the request through. No authentication context is set; the token getter falls back to the server operator’s META_ACCESS_TOKEN environment variable. Every subsequent MCP tool call executes with the operator’s Meta credentials, allowing an unauthenticated network caller to read and write the operator’s Meta Ads data.