diff --git a/src/bootstrap.js b/src/bootstrap.js
index f011a25a1..eeacabc9c 100644
--- a/src/bootstrap.js
+++ b/src/bootstrap.js
@@ -50,6 +50,9 @@ const cacheEnabled = document.head.querySelector(
 const cacheTimeout = document.head.querySelector(
   "meta[name='screen-cache-timeout']"
 );
+const secureHandlerToggleVisibleMeta = document.head.querySelector(
+  "meta[name='screen-secure-handler-toggle-visible']"
+);
 
 // Get the current protocol, hostname, and port
 const { protocol, hostname, port } = window.location;
@@ -73,7 +76,10 @@ window.ProcessMaker = {
   alert(message, variant) {},
   screen: {
     cacheEnabled: cacheEnabled ? cacheEnabled.content === "true" : false,
-    cacheTimeout: cacheTimeout ? Number(cacheTimeout.content) : 0
+    cacheTimeout: cacheTimeout ? Number(cacheTimeout.content) : 0,
+    secureHandlerToggleVisible: !!Number(
+      secureHandlerToggleVisibleMeta?.content
+    )
   }
 };
 window.Echo = {
diff --git a/src/components/inspector/button/handler-event-property.js b/src/components/inspector/button/handler-event-property.js
index 17a4885cc..baa732e30 100644
--- a/src/components/inspector/button/handler-event-property.js
+++ b/src/components/inspector/button/handler-event-property.js
@@ -1,9 +1,21 @@
 export const handlerEventProperty = {
-  type: 'CodeEditor',
-  field: 'handler',
+  type: "CodeEditor",
+  field: "handler",
   config: {
-    label: 'Click Handler',
-    helper: 'The handler is a JavaScript function that will be executed when the button is clicked.',
-    dataFeature: 'i1177',
-  },
+    label: "Click Handler",
+    helper:
+      "The handler is a JavaScript function that will be executed when the button is clicked.",
+    dataFeature: "i1177"
+  }
+};
+
+export const handlerSecurityProperty = {
+  type: "FormCheckbox",
+  field: "handlerSecurityEnabled",
+  config: {
+    label: "Secure Handler Execution",
+    toggle: true,
+    helper:
+      "When enabled, the handler runs inside a sandboxed worker. Disable to allow full JavaScript access."
+  }
 };
diff --git a/src/components/renderer/form-button.vue b/src/components/renderer/form-button.vue
index 9d09e717c..8f1c06fc0 100644
--- a/src/components/renderer/form-button.vue
+++ b/src/components/renderer/form-button.vue
@@ -2,12 +2,12 @@
   <div class="form-group" style="overflow-x: hidden">
     <button
       v-b-tooltip="options"
-      @click="click"
       :class="classList"
       :name="name"
       :aria-label="$attrs['aria-label']"
       :tabindex="$attrs['tabindex']"
       :disabled="showSpinner"
+      @click="click"
     >
       <b-spinner v-if="showSpinner" small></b-spinner>
       {{ showSpinner ? (!loadingLabel ? "Loading..." : loadingLabel) : label }}
@@ -15,13 +15,16 @@
   </div>
 </template>
 
+<!-- eslint-disable import/no-extraneous-dependencies -->
+<!-- eslint-disable import/no-unresolved -->
+<!-- eslint-disable import/extensions -->
 <script>
-import Mustache from 'mustache';
-import { mapActions, mapState } from "vuex";
-import { getValidPath } from '@/mixins';
+import Mustache from "mustache";
+import { mapState } from "vuex";
+import { stringify } from "flatted";
+import { getValidPath } from "@/mixins";
 import Worker from "@/workers/worker.js?worker&inline";
 import { findRootScreen } from "@/mixins/DataReference";
-import { stringify } from 'flatted';
 
 export default {
   mixins: [getValidPath],
@@ -37,7 +40,8 @@ export default {
     "transientData",
     "loading",
     "loadingLabel",
-    "handler"
+    "handler",
+    "handlerSecurityEnabled"
   ],
   data() {
     return {
@@ -47,30 +51,35 @@ export default {
   computed: {
     ...mapState("globalErrorsModule", ["valid"]),
     classList() {
-      let variant = this.variant || 'primary';
+      const variant = this.variant || "primary";
       return {
         btn: true,
-        ['btn-' + variant]: true,
-        disabled: this.event === 'submit' && !this.valid
+        [`btn-${variant}`]: true,
+        disabled: this.event === "submit" && !this.valid
       };
     },
     options() {
-      if (!this.tooltip || this.event === 'submit') {
+      if (!this.tooltip || this.event === "submit") {
         return {};
       }
 
-      let content = '';
+      let content = "";
       try {
-        content = Mustache.render(this.tooltip.content || '', this.transientData);
-      } catch (error) { error; }
+        content = Mustache.render(
+          this.tooltip.content || "",
+          this.transientData
+        );
+      } catch (error) {
+        console.error(error);
+      }
 
       return {
         title: content,
         html: true,
-        placement: this.tooltip.position || '',
-        trigger: 'hover',
-        variant: this.tooltip.variant || '',
-        boundary: 'window',
+        placement: this.tooltip.position || "",
+        trigger: "hover",
+        variant: this.tooltip.variant || "",
+        boundary: "window"
       };
     },
     buttonInfo() {
@@ -92,74 +101,150 @@ export default {
       }
     },
     async click() {
-      if (this.event === 'script') {
-        const trueValue = this.fieldValue || '1';
-        const value = (this.value == trueValue) ? null : trueValue;
-        this.$emit('input', value);
+      if (this.event === "script") {
+        const trueValue = this.fieldValue || "1";
+        // eslint-disable-next-line eqeqeq
+        const value = this.value == trueValue ? null : trueValue;
+        this.$emit("input", value);
         // Run handler after setting the value
         await this.runHandler();
       }
-      if (this.event !== 'pageNavigate' && this.name) {
+      if (this.event !== "pageNavigate" && this.name) {
         this.setValue(this.$parent, this.name, this.fieldValue);
       }
-      if (this.event === 'submit') {
+      if (this.event === "submit") {
         if (this.loading && this.valid) {
           this.showSpinner = true;
         }
-        this.$emit('input', this.fieldValue);
+        this.$emit("input", this.fieldValue);
         // Run handler after setting the value
         await this.runHandler();
         this.$nextTick(() => {
-          this.$emit('submit', this.eventData, this.loading, this.buttonInfo);
+          this.$emit("submit", this.eventData, this.loading, this.buttonInfo);
         });
         return;
       }
-      if (this.event === 'pageNavigate') {
+      if (this.event === "pageNavigate") {
         // Run handler for page navigate
         await this.runHandler();
       }
       this.$emit(this.event, this.eventData);
-      if (this.event === 'pageNavigate') {
-        this.$emit('page-navigate', this.eventData);
+      if (this.event === "pageNavigate") {
+        this.$emit("page-navigate", this.eventData);
       }
     },
     runHandler() {
-      if (this.handler) {
-        return new Promise((resolve, reject) => {
-          try {
-            const rootScreen = findRootScreen(this);
-            const data = rootScreen.vdata;
-            const scope = this.transientData;
+      if (!this.handler) {
+        return Promise.resolve();
+      }
 
-            const worker = new Worker();
-            // Send the handler code to the worker
-            worker.postMessage({
-              fn: this.handler,
-              dataRefs: stringify({data, scope}),
-            });
+      const rootScreen = findRootScreen(this);
+      const data = rootScreen.vdata;
+      const scope = this.transientData;
 
-            // Listen for the result from the worker
-            worker.onmessage = (e) => {
-              if (e.data.error) {
-                reject(e.data.error);
-              } else if (e.data.result) {
-                // Update the data with the result
-                Object.keys(e.data.result).forEach(key => {
-                  if (key === '_root') {
-                    Object.assign(data, e.data.result[key]);
-                  } else {
-                    scope[key] = e.data.result[key];
-                  }
-                });
-                resolve();
-              }
-            };
-          } catch (error) {
-            console.error("❌ There is an error in the button handler", error);
-          }
-        });
+      if (this.handlerSecurityEnabled === false) {
+        return this.executeHandlerWithoutWorker(data, scope);
       }
+
+      return this.executeHandlerWithWorker(data, scope);
+    },
+    executeHandlerWithWorker(data, scope) {
+      return new Promise((resolve, reject) => {
+        try {
+          const worker = new Worker();
+          worker.postMessage({
+            fn: this.handler,
+            dataRefs: stringify({ data, scope })
+          });
+
+          worker.onmessage = (e) => {
+            worker.terminate();
+            if (e.data.error) {
+              console.error(
+                "There is an error in the button handler",
+                e.data.error
+              );
+              reject(e.data.error);
+              return;
+            }
+            this.applyHandlerResult(e.data.result, data, scope);
+            resolve();
+          };
+
+          worker.onerror = (errorEvent) => {
+            worker.terminate();
+            console.error(
+              "There is an error in the button handler",
+              errorEvent
+            );
+            reject(errorEvent);
+          };
+        } catch (error) {
+          console.error("There is an error in the button handler", error);
+          reject(error);
+        }
+      });
+    },
+    executeHandlerWithoutWorker(data, scope) {
+      const hasDataReferenceHelper =
+        typeof this.getScreenDataReference === "function";
+      const dataReference = hasDataReferenceHelper
+        ? this.getScreenDataReference(null, (screen, name, value) => {
+            screen.$set(screen.vdata, name, value);
+          })
+        : data;
+      const parentReference =
+        hasDataReferenceHelper && dataReference
+          ? dataReference._parent
+          : undefined;
+      const context = scope || dataReference;
+      const toRaw = (item) => (item && item[Symbol.for("__v_raw")]) || item;
+      const functionBody = `return (async () => { ${this.handler} })();`;
+
+      try {
+        // eslint-disable-next-line no-new-func, max-len
+        const userFunc = new Function("data", "parent", "toRaw", functionBody); // NOSONAR. This dynamic code execution is safe because it only occurs when the user has explicitly disabled the security worker.
+        const result = userFunc.apply(context, [
+          dataReference,
+          parentReference,
+          toRaw
+        ]);
+        return this.resolveHandlerResult(result, data, scope);
+      } catch (error) {
+        console.error("There is an error in the button handler", error);
+        return Promise.reject(error);
+      }
+    },
+    resolveHandlerResult(result, data, scope) {
+      if (result && typeof result.then === "function") {
+        return result
+          .then((resolved) => {
+            this.applyHandlerResult(resolved, data, scope);
+          })
+          .catch((error) => {
+            console.error("There is an error in the button handler", error);
+            throw error;
+          });
+      }
+
+      this.applyHandlerResult(result, data, scope);
+      return Promise.resolve();
+    },
+    applyHandlerResult(result, data, scope) {
+      if (!result || typeof result !== "object") {
+        return;
+      }
+
+      const targetScope = scope || this.transientData || {};
+
+      Object.keys(result).forEach((key) => {
+        if (key === "_root") {
+          Object.assign(data, result[key]);
+        } else {
+          this.$set(targetScope, key, result[key]);
+        }
+      });
     }
-  },
+  }
 };
 </script>
diff --git a/src/components/vue-form-builder.vue b/src/components/vue-form-builder.vue
index b45adf4c9..1f616fb13 100644
--- a/src/components/vue-form-builder.vue
+++ b/src/components/vue-form-builder.vue
@@ -810,6 +810,13 @@ export default {
     },
     showToolbar() {
       return this.screenType === formTypes.form;
+    },
+    secureHandlerToggleVisible() {
+      return _.get(
+        globalObject,
+        "ProcessMaker.screen.secureHandlerToggleVisible",
+        false
+      );
     }
   },
   watch: {
@@ -1220,6 +1227,13 @@ export default {
           (control) => control.component === this.inspection.component
         ) || { inspector: [] };
       return control.inspector.filter((input) => {
+        if (
+          !this.secureHandlerToggleVisible &&
+          typeof input === "object" &&
+          input.field === "handlerSecurityEnabled"
+        ) {
+          return false;
+        }
         if (accordionFields.includes(input.field)) {
           return true;
         }
diff --git a/src/form-builder-controls.js b/src/form-builder-controls.js
index 0dd899444..5bf4f9151 100755
--- a/src/form-builder-controls.js
+++ b/src/form-builder-controls.js
@@ -14,7 +14,7 @@ import FormListTable from './components/renderer/form-list-table';
 import FormAnalyticsChart from "./components/renderer/form-analytics-chart";
 import FormCollectionRecordControl from './components/renderer/form-collection-record-control.vue';
 import FormCollectionViewControl from './components/renderer/form-collection-view-control.vue';
-import { handlerEventProperty } from './components/inspector/button/handler-event-property';
+import { handlerEventProperty, handlerSecurityProperty } from './components/inspector/button/handler-event-property';
 import {DataTypeProperty, DataFormatProperty, DataTypeDateTimeProperty} from './VariableDataTypeProperties';
 import {
   FormInput,
@@ -763,6 +763,7 @@ export default [
         fieldValue: null,
         tooltip: {},
         handler: '',
+        handlerSecurityEnabled: true,
       },
       inspector: [
         {
@@ -786,6 +787,7 @@ export default [
         },
         buttonTypeEvent,
         handlerEventProperty,
+        handlerSecurityProperty,
         LoadingSubmitButtonProperty,
         LabelSubmitButtonProperty,
         tooltipProperty,
diff --git a/src/main.js b/src/main.js
index 0d2c5344d..18ba1e940 100644
--- a/src/main.js
+++ b/src/main.js
@@ -152,6 +152,10 @@ const cacheEnabled = document.head.querySelector(
 const cacheTimeout = document.head.querySelector(
   "meta[name='screen-cache-timeout']"
 );
+const secureHandlerToggleVisibleMeta = document.head.querySelector(
+  "meta[name='screen-secure-handler-toggle-visible']"
+);
+
 // Get the current protocol, hostname, and port
 const { protocol, hostname, port } = window.location;
 window.ProcessMaker = {
@@ -302,7 +306,10 @@ window.ProcessMaker = {
   },
   screen: {
     cacheEnabled: cacheEnabled ? cacheEnabled.content === "true" : false,
-    cacheTimeout: cacheTimeout ? Number(cacheTimeout.content) : 0
+    cacheTimeout: cacheTimeout ? Number(cacheTimeout.content) : 0,
+    secureHandlerToggleVisible: !!Number(
+      secureHandlerToggleVisibleMeta?.content
+    )
   }
 };
 window.Echo = {
diff --git a/src/mixins/extensions/LoadFieldComponents.js b/src/mixins/extensions/LoadFieldComponents.js
index 52632aecb..2166fd91b 100644
--- a/src/mixins/extensions/LoadFieldComponents.js
+++ b/src/mixins/extensions/LoadFieldComponents.js
@@ -55,11 +55,19 @@ export default {
             componentName === "FormTextArea" ||
             componentName === "FormInput"
           ) {
-            properties["@input"] = `updateScreenData('${safeDotName}', '${element.config.name}')`;
-            properties["@change"] = `updateScreenDataNow('${safeDotName}', '${element.config.name}')`;
+            properties[
+              "@input"
+            ] = `updateScreenData('${safeDotName}', '${element.config.name}')`;
+            properties[
+              "@change"
+            ] = `updateScreenDataNow('${safeDotName}', '${element.config.name}')`;
           } else {
-            properties["@input"] = `updateScreenDataNow('${safeDotName}', '${element.config.name}')`;
-            properties["@change"] = `updateScreenDataNow('${safeDotName}', '${element.config.name}')`;
+            properties[
+              "@input"
+            ] = `updateScreenDataNow('${safeDotName}', '${element.config.name}')`;
+            properties[
+              "@change"
+            ] = `updateScreenDataNow('${safeDotName}', '${element.config.name}')`;
           }
           // Process the FormSelectList@reset event
           properties[
@@ -100,12 +108,17 @@ export default {
       properties[":readonly"] = isCalcProp || element.config.readonly;
       properties[":disabled"] = isCalcProp || element.config.disabled;
       // Events
-      properties['@submit'] = 'submitForm';
+      properties["@submit"] = "submitForm";
       // Add handler event if Button
-      if(componentName === 'FormButton') {
-        properties[':handler'] = this.byRef(element.config.handler);
+      if (componentName === "FormButton") {
+        properties[":handler"] = this.byRef(element.config.handler);
+        const handlerSecurity =
+          element.config.handlerSecurityEnabled === undefined
+            ? true
+            : element.config.handlerSecurityEnabled;
+        properties[":handler-security-enabled"] = this.byRef(handlerSecurity);
       }
-    },
+    }
   },
   mounted() {
     this.extensions.push({