diff --git a/django_forms_workflows/static/django_forms_workflows/js/workflow-builder.js b/django_forms_workflows/static/django_forms_workflows/js/workflow-builder.js
index 5475224..91727fd 100644
--- a/django_forms_workflows/static/django_forms_workflows/js/workflow-builder.js
+++ b/django_forms_workflows/static/django_forms_workflows/js/workflow-builder.js
@@ -4,7 +4,7 @@
  * Drag-and-drop workflow builder for post-submission actions and approvals.
  */
 
-class WorkflowBuilder {
+export class WorkflowBuilder {
     constructor(config) {
         this.config = config;
         this.nodes = [];
@@ -1784,7 +1784,7 @@ class WorkflowBuilder {
 
             fields.forEach(field => {
                 const prefillBadge = field.prefill_source ?
-                    `<span class="badge bg-info ms-2" title="Auto-filled from ${field.prefill_source}"><i class="bi bi-magic"></i> ${field.prefill_source}</span>` : '';
+                    `<span class="badge bg-info ms-2" title="Auto-filled from ${this.escapeHtml(field.prefill_source)}"><i class="bi bi-magic"></i> ${this.escapeHtml(field.prefill_source)}</span>` : '';
                 const requiredBadge = field.required ?
                     `<span class="badge bg-warning ms-1">Required</span>` : '';
 
@@ -1793,7 +1793,7 @@ class WorkflowBuilder {
                         <div class="d-flex justify-content-between align-items-start">
                             <div>
                                 <strong>${this.escapeHtml(field.label)}</strong>
-                                <small class="text-muted d-block">${field.name} (${field.type})</small>
+                                <small class="text-muted d-block">${this.escapeHtml(field.name)} (${this.escapeHtml(field.type)})</small>
                             </div>
                             <div>
                                 ${requiredBadge}
@@ -2893,10 +2893,10 @@ class WorkflowBuilder {
                 return `${badgeHtml}${fieldCount} field${fieldCount !== 1 ? 's' : ''} • <a href="${node.data.form_builder_url || '#'}" target="_blank" class="text-primary form-edit-link"><i class="bi bi-pencil-square"></i> Edit Form</a>`;
             case 'workflow_settings':
                 const parts_ws = [];
-                if (node.data.name_label) parts_ws.push(node.data.name_label);
+                if (node.data.name_label) parts_ws.push(this.escapeHtml(node.data.name_label));
                 if (node.data.approval_deadline_days) parts_ws.push(`Deadline: ${node.data.approval_deadline_days}d`);
-                if (node.data.notification_cadence && node.data.notification_cadence !== 'immediate') parts_ws.push(`Cadence: ${node.data.notification_cadence}`);
-                if (node.data.notification_cadence_form_field && node.data.notification_cadence === 'form_field_date') parts_ws.push(`Date field: ${node.data.notification_cadence_form_field}`);
+                if (node.data.notification_cadence && node.data.notification_cadence !== 'immediate') parts_ws.push(`Cadence: ${this.escapeHtml(node.data.notification_cadence)}`);
+                if (node.data.notification_cadence_form_field && node.data.notification_cadence === 'form_field_date') parts_ws.push(`Date field: ${this.escapeHtml(node.data.notification_cadence_form_field)}`);
                 if (node.data.notification_rules && node.data.notification_rules.length > 0) parts_ws.push(`Notifications: ${node.data.notification_rules.length}`);
                 if (node.data.trigger_conditions && node.data.trigger_conditions.conditions && node.data.trigger_conditions.conditions.length > 0) parts_ws.push('Conditional');
                 return parts_ws.length > 0 ?
@@ -2908,14 +2908,14 @@ class WorkflowBuilder {
                 if (node.data.allow_send_back) stageParts.push('Send Back target');
                 if (node.data.allow_reassign) stageParts.push('Reassign');
                 if (node.data.allow_edit_form_data) stageParts.push('Editable');
-                if (node.data.assignee_form_field) stageParts.push(`Dynamic: ${node.data.assignee_form_field}`);
+                if (node.data.assignee_form_field) stageParts.push(`Dynamic: ${this.escapeHtml(node.data.assignee_form_field)}`);
                 if (node.data.approval_fields && node.data.approval_fields.length > 0) stageParts.push(`Stage fields: ${node.data.approval_fields.length}`);
                 if (node.data.trigger_conditions && node.data.trigger_conditions.conditions && node.data.trigger_conditions.conditions.length > 0) stageParts.push('Conditional');
                 if (node.data.approval_groups && node.data.approval_groups.length > 0) {
                     const gc = node.data.approval_groups.length;
-                    stageParts.push(`${gc} group${gc > 1 ? 's' : ''} (${node.data.approval_logic || 'all'})`);
+                    stageParts.push(`${gc} group${gc > 1 ? 's' : ''} (${this.escapeHtml(node.data.approval_logic || 'all')})`);
                 }
-                const label = node.data.approve_label ? ` • "${node.data.approve_label}"` : '';
+                const label = node.data.approve_label ? ` • "${this.escapeHtml(node.data.approve_label)}"` : '';
                 return stageParts.length > 0 ?
                     `<span class="badge bg-warning">Stage ${node.data.order || '?'}</span><br><small class="text-muted">${stageParts.join(' + ')}${label}</small>` :
                     `<span class="badge bg-secondary">Stage ${node.data.order || '?'}</span><br><small class="text-muted">No approvers configured</small>`;
@@ -2934,22 +2934,22 @@ class WorkflowBuilder {
                         'not_empty': 'is not empty'
                     };
                     const op = operatorSymbols[node.data.operator] || node.data.operator;
-                    return `If ${node.data.field} ${op} ${node.data.value || ''}`;
+                    return `If ${this.escapeHtml(node.data.field)} ${this.escapeHtml(op)} ${this.escapeHtml(node.data.value || '')}`;
                 }
                 return 'Configure condition';
             case 'action':
-                return node.data.action_type ? `${node.data.action_type.toUpperCase()}: ${node.data.trigger || ''}` : 'Configure action';
+                return node.data.action_type ? `${this.escapeHtml(node.data.action_type.toUpperCase())}: ${this.escapeHtml(node.data.trigger || '')}` : 'Configure action';
             case 'email':
-                if (node.data.email_to && node.data.email_to_field) return `Send to: ${node.data.email_to} + field ${node.data.email_to_field}`;
-                if (node.data.email_to) return `Send to: ${node.data.email_to}`;
-                if (node.data.email_to_field) return `Send to field: ${node.data.email_to_field}`;
+                if (node.data.email_to && node.data.email_to_field) return `Send to: ${this.escapeHtml(node.data.email_to)} + field ${this.escapeHtml(node.data.email_to_field)}`;
+                if (node.data.email_to) return `Send to: ${this.escapeHtml(node.data.email_to)}`;
+                if (node.data.email_to_field) return `Send to field: ${this.escapeHtml(node.data.email_to_field)}`;
                 return 'Configure email';
             case 'join':
                 return '<small class="text-muted">Parallel stages merge here</small>';
             case 'sub_workflow':
                 const swParts = [];
-                if (node.data.sub_workflow_name) swParts.push(node.data.sub_workflow_name);
-                if (node.data.count_field) swParts.push(`Count: ${node.data.count_field}`);
+                if (node.data.sub_workflow_name) swParts.push(this.escapeHtml(node.data.sub_workflow_name));
+                if (node.data.count_field) swParts.push(`Count: ${this.escapeHtml(node.data.count_field)}`);
                 if (node.data.trigger) swParts.push(node.data.trigger === 'on_approval' ? 'After approval' : 'On submission');
                 if (node.data.detached) swParts.push('Detached');
                 if (node.data.reject_parent) swParts.push('Rejects parent');
@@ -3162,6 +3162,3 @@ class WorkflowBuilder {
         return `M ${x1} ${y1} C ${cx1} ${y1}, ${cx2} ${y2}, ${x2} ${y2}`;
     }
 }
-
-// This script is loaded before the inline admin bootstrap code.
-window.WorkflowBuilder = WorkflowBuilder;
diff --git a/django_forms_workflows/templates/admin/django_forms_workflows/workflow_builder.html b/django_forms_workflows/templates/admin/django_forms_workflows/workflow_builder.html
index 08a7705..7c3d90a 100644
--- a/django_forms_workflows/templates/admin/django_forms_workflows/workflow_builder.html
+++ b/django_forms_workflows/templates/admin/django_forms_workflows/workflow_builder.html
@@ -1119,8 +1119,9 @@ <h6><i class="bi bi-info-circle"></i> Visual Builder Scope</h6>
 
 {% block extrahead %}
 <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/js/bootstrap.bundle.min.js"></script>
-<script src="{% static 'django_forms_workflows/js/workflow-builder.js' %}"></script>
-<script>
+<script type="module">
+    import { WorkflowBuilder } from "{% static 'django_forms_workflows/js/workflow-builder.js' %}";
+
     const WORKFLOW_CONFIG = {
         formId: {{ form_id }},
         currentWorkflowId: {{ workflow_id }},
diff --git a/tests_js/workflow-builder/moduleAndEscaping.test.js b/tests_js/workflow-builder/moduleAndEscaping.test.js
new file mode 100644
index 0000000..03288f7
--- /dev/null
+++ b/tests_js/workflow-builder/moduleAndEscaping.test.js
@@ -0,0 +1,127 @@
+import { describe, expect, it } from 'vitest';
+import { WorkflowBuilder } from '../../django_forms_workflows/static/django_forms_workflows/js/workflow-builder.js';
+
+function createInstance() {
+  return Object.create(WorkflowBuilder.prototype);
+}
+
+describe('WorkflowBuilder module wiring', () => {
+  it('is importable as a real ES export (not just a classic-script global)', () => {
+    expect(typeof WorkflowBuilder).toBe('function');
+    expect(typeof WorkflowBuilder.prototype.getNodeDescription).toBe('function');
+    expect(typeof WorkflowBuilder.prototype.buildFormProperties).toBe('function');
+  });
+});
+
+describe('WorkflowBuilder#getNodeDescription — escaping regression', () => {
+  const payload = '"><script>alert(1)</script>';
+
+  it('escapes workflow_settings name_label/notification_cadence/notification_cadence_form_field', () => {
+    const instance = createInstance();
+    const node = {
+      type: 'workflow_settings',
+      data: {
+        name_label: payload,
+        notification_cadence: 'form_field_date',
+        notification_cadence_form_field: payload,
+      },
+    };
+
+    const html = instance.getNodeDescription(node);
+
+    expect(html).not.toContain('<script>alert');
+  });
+
+  it('escapes stage assignee_form_field, approval_logic, and approve_label', () => {
+    const instance = createInstance();
+    const node = {
+      type: 'stage',
+      data: {
+        assignee_form_field: payload,
+        approval_logic: payload,
+        approval_groups: [{ id: 1 }],
+        approve_label: payload,
+      },
+    };
+
+    const html = instance.getNodeDescription(node);
+
+    expect(html).not.toContain('<script>alert');
+  });
+
+  it('escapes condition field/operator/value', () => {
+    const instance = createInstance();
+    const node = {
+      type: 'condition',
+      data: { field: payload, operator: payload, value: payload },
+    };
+
+    const html = instance.getNodeDescription(node);
+
+    expect(html).not.toContain('<script>alert');
+  });
+
+  it('escapes action action_type/trigger', () => {
+    const instance = createInstance();
+    const node = {
+      type: 'action',
+      data: { action_type: payload, trigger: payload },
+    };
+
+    const html = instance.getNodeDescription(node);
+
+    expect(html).not.toContain('<script>alert');
+  });
+
+  it('escapes email email_to/email_to_field', () => {
+    const instance = createInstance();
+    const node = {
+      type: 'email',
+      data: { email_to: payload, email_to_field: payload },
+    };
+
+    const html = instance.getNodeDescription(node);
+
+    expect(html).not.toContain('<script>alert');
+  });
+
+  it('escapes sub_workflow sub_workflow_name/count_field', () => {
+    const instance = createInstance();
+    const node = {
+      type: 'sub_workflow',
+      data: { sub_workflow_name: payload, count_field: payload },
+    };
+
+    const html = instance.getNodeDescription(node);
+
+    expect(html).not.toContain('<script>alert');
+  });
+});
+
+describe('WorkflowBuilder#buildFormProperties — escaping regression', () => {
+  it('escapes field.name, field.type, and field.prefill_source in the field list', () => {
+    const instance = createInstance();
+    const payload = '"><script>alert(1)</script>';
+    const node = {
+      id: 'form_1',
+      data: {
+        is_initial: true,
+        form_name: 'Test Form',
+        field_count: 1,
+        fields: [
+          {
+            label: payload,
+            name: payload,
+            type: payload,
+            prefill_source: payload,
+          },
+        ],
+        has_more_fields: false,
+      },
+    };
+
+    const html = instance.buildFormProperties(node);
+
+    expect(html).not.toContain('<script>alert');
+  });
+});