A flaw was found in Kruize Autotune. Its REST API ships without an authentication layer, and the endpoints that return datasource configuration — the list-datasources endpoint (GET /datasources) and the datasource-metadata endpoint — serialized datasource objects using a default Gson configuration with no field-exclusion strategy. As a result, the authentication secrets stored for each configured monitoring datasource (basic-auth passwords, bearer tokens, API keys, and OAuth2 client secrets) were returned in cleartext to any client able to reach the service. An attacker with network access to Autotune could harvest these credentials and reuse them to authenticate to the backing monitoring stack.