CVE-2026-71204 changedetection.io: Omitted Checkbox in /settings Save Silently Disables API Key Enforcement

changedetection.io's /settings save handler builds an update dict from form.data'application' and blind-merges it into the stored application settings via .update. Because WTForms represents an unchecked checkbox as False rather than 'unchanged', and only the 'password' field is special-cased...