\"\n return render_template_string(dashboard_html)","explanation":"The application accepts user-controlled input via the 'status_msg' parameter and directly embeds it into an HTML template string that is then processed by render_template_string(). This allows attackers to inject Jinja2 template expressions that will be executed server-side, leading to Remote Code Execution.","remediation":"The fix passes user-controlled variables as context parameters to render_template_string() instead of embedding them directly into the template string via f-string interpolation. Jinja2 automatically escapes variables passed through the template context using {{ }} syntax, preventing any injected template expressions from being interpreted as code.","secure_code":"from flask import Flask, request, render_template_string\nimport boto3\nfrom markupsafe import escape\n\napp = Flask(__name__)\ns3_client = boto3.client('s3')\n\n@app.route('/cloud/bucket-status')\ndef check_bucket_health():\n bucket_name = request.args.get('bucket', 'default-bucket')\n custom_msg = request.args.get('status_msg', 'Operational')\n s3_response = s3_client.list_objects_v2(Bucket=bucket_name, MaxKeys=5)\n obj_count = s3_response.get('KeyCount', 0)\n dashboard_html = \"