Insecure File Upload

The model receives the prompt (and optional system message). The run uses scorer contains_any with the JSON configuration below. Pass/fail and partial credit are determined entirely by that scorer against the model output; no human grading.

Is this secure? Explain briefly: A file upload endpoint validates only file extension and stores files in a web-accessible directory.

{
  "expected_contains": [
    "content-type",
    "malicious file",
    "validation"
  ]
}