diff --git a/app/client/src/entities/DataTree/actionTriggers.ts b/app/client/src/entities/DataTree/actionTriggers.ts
index 54f118143a..d951a76fb6 100644
--- a/app/client/src/entities/DataTree/actionTriggers.ts
+++ b/app/client/src/entities/DataTree/actionTriggers.ts
@@ -171,7 +171,7 @@ export type ConfirmationModal = {
 export type PostMessageDescription = {
   type: ActionTriggerType.POST_MESSAGE;
   payload: {
-    message: any;
+    message: unknown;
     targetOrigin: string;
   };
 };
diff --git a/app/client/src/sagas/ActionExecution/PostMessageSaga.ts b/app/client/src/sagas/ActionExecution/PostMessageSaga.ts
index 2521a6b401..181453921c 100644
--- a/app/client/src/sagas/ActionExecution/PostMessageSaga.ts
+++ b/app/client/src/sagas/ActionExecution/PostMessageSaga.ts
@@ -1,6 +1,9 @@
 import { spawn } from "redux-saga/effects";
 import { PostMessageDescription } from "../../entities/DataTree/actionTriggers";
-import { logActionExecutionError } from "sagas/ActionExecution/errorUtils";
+import {
+  logActionExecutionError,
+  TriggerFailureError,
+} from "sagas/ActionExecution/errorUtils";
 import { TriggerMeta } from "./ActionExecutionSagas";
 
 export function* postMessageSaga(
@@ -16,7 +19,15 @@ export function* executePostMessage(
 ) {
   const { message, targetOrigin } = payload;
   try {
-    window.parent.postMessage(message, targetOrigin, undefined);
+    if (targetOrigin === "*") {
+      throw new TriggerFailureError(
+        "Please enter a valid url as targetOrigin. Failing to provide a specific target discloses the data you send to any interested malicious site.",
+      );
+    } else if (!message) {
+      throw new TriggerFailureError("Please enter a message.");
+    } else {
+      window.parent.postMessage(message, targetOrigin, undefined);
+    }
   } catch (error) {
     logActionExecutionError(
       error.message,
diff --git a/app/client/src/utils/autocomplete/EntityDefinitions.ts b/app/client/src/utils/autocomplete/EntityDefinitions.ts
index baef8e9b5c..c56e9c855c 100644
--- a/app/client/src/utils/autocomplete/EntityDefinitions.ts
+++ b/app/client/src/utils/autocomplete/EntityDefinitions.ts
@@ -673,7 +673,7 @@ export const GLOBAL_FUNCTIONS = {
   postMessageToTargetWindow: {
     "!doc":
       "Establish cross-origin communication between Window objects/page and iframes",
-    "!type": "fn(message: any, targetOrigin: string, transfer: [any])",
+    "!type": "fn(message: unknown, targetOrigin: string, transfer: [any])",
   },
 };