diff --git a/app/config/errors.php b/app/config/errors.php
index 7dedc373ef..1cb5ec30f6 100644
--- a/app/config/errors.php
+++ b/app/config/errors.php
@@ -103,6 +103,11 @@ return [
         'description' => 'This method was not fully implemented yet. If you believe this is a mistake, please upgrade your Appwrite server version.',
         'code' => 405,
     ],
+    Exception::GENERAL_BAD_REQUEST => [
+        'name' => Exception::GENERAL_BAD_REQUEST,
+        'description' => 'There was an error processing your request. Please check the inputs and try again.',
+        'code' => 400,
+    ],
 
     /** User Errors */
     Exception::USER_COUNT_EXCEEDED => [
diff --git a/app/controllers/api/account.php b/app/controllers/api/account.php
index b59ab40e0d..ef82be9ef5 100644
--- a/app/controllers/api/account.php
+++ b/app/controllers/api/account.php
@@ -110,7 +110,7 @@ App::post('/v1/account')
             Query::equal('providerEmail', [$email]),
         ]);
         if ($identityWithMatchingEmail !== false && !$identityWithMatchingEmail->isEmpty()) {
-            throw new Exception(Exception::USER_EMAIL_ALREADY_EXISTS);
+            throw new Exception(Exception::GENERAL_BAD_REQUEST); /** Return a generic bad request to prevent exposing existing accounts */
         }
 
         if ($project->getAttribute('auths', [])['personalDataCheck'] ?? false) {
@@ -637,7 +637,7 @@ App::get('/v1/account/sessions/oauth2/:provider/redirect')
                     Query::equal('providerEmail', [$email]),
                 ]);
                 if ($identityWithMatchingEmail !== false && !$identityWithMatchingEmail->isEmpty()) {
-                    throw new Exception(Exception::USER_EMAIL_ALREADY_EXISTS);
+                    throw new Exception(Exception::GENERAL_BAD_REQUEST); /** Return a generic bad request to prevent exposing existing accounts */
                 }
 
                 try {
@@ -695,7 +695,7 @@ App::get('/v1/account/sessions/oauth2/:provider/redirect')
                 Query::notEqual('userId', $user->getId()),
             ]);
             if (!empty($identitiesWithMatchingEmail)) {
-                throw new Exception(Exception::USER_EMAIL_ALREADY_EXISTS);
+                throw new Exception(Exception::GENERAL_BAD_REQUEST); /** Return a generic bad request to prevent exposing existing accounts */
             }
 
             $dbForProject->createDocument('identities', new Document([
@@ -944,7 +944,7 @@ App::post('/v1/account/sessions/magic-url')
                 Query::equal('providerEmail', [$email]),
             ]);
             if ($identityWithMatchingEmail !== false && !$identityWithMatchingEmail->isEmpty()) {
-                throw new Exception(Exception::USER_EMAIL_ALREADY_EXISTS);
+                throw new Exception(Exception::GENERAL_BAD_REQUEST); /** Return a generic bad request to prevent exposing existing accounts */
             }
 
             $userId = $userId === 'unique()' ? ID::unique() : $userId;
@@ -1988,7 +1988,7 @@ App::patch('/v1/account/email')
             Query::notEqual('userId', $user->getId()),
         ]);
         if ($identityWithMatchingEmail !== false && !$identityWithMatchingEmail->isEmpty()) {
-            throw new Exception(Exception::USER_EMAIL_ALREADY_EXISTS);
+            throw new Exception(Exception::GENERAL_BAD_REQUEST); /** Return a generic bad request to prevent exposing existing accounts */
         }
 
         $user
@@ -2007,7 +2007,7 @@ App::patch('/v1/account/email')
         try {
             $user = $dbForProject->withRequestTimestamp($requestTimestamp, fn () => $dbForProject->updateDocument('users', $user->getId(), $user));
         } catch (Duplicate) {
-            throw new Exception(Exception::USER_EMAIL_ALREADY_EXISTS);
+            throw new Exception(Exception::GENERAL_BAD_REQUEST); /** Return a generic bad request to prevent exposing existing accounts */
         }
 
         $queueForEvents->setParam('userId', $user->getId());
diff --git a/src/Appwrite/Extend/Exception.php b/src/Appwrite/Extend/Exception.php
index 3cedbf11c7..5d5d1b8f1f 100644
--- a/src/Appwrite/Extend/Exception.php
+++ b/src/Appwrite/Extend/Exception.php
@@ -55,6 +55,7 @@ class Exception extends \Exception
     public const GENERAL_CODES_DISABLED            = 'general_codes_disabled';
     public const GENERAL_USAGE_DISABLED            = 'general_usage_disabled';
     public const GENERAL_NOT_IMPLEMENTED           = 'general_not_implemented';
+    public const GENERAL_BAD_REQUEST               = 'general_bad_request';
 
     /** Users */
     public const USER_COUNT_EXCEEDED               = 'user_count_exceeded';
diff --git a/tests/e2e/Services/Account/AccountCustomClientTest.php b/tests/e2e/Services/Account/AccountCustomClientTest.php
index 56280b4b49..8f8d4922a1 100644
--- a/tests/e2e/Services/Account/AccountCustomClientTest.php
+++ b/tests/e2e/Services/Account/AccountCustomClientTest.php
@@ -476,7 +476,7 @@ class AccountCustomClientTest extends Scope
             'password' => $password,
         ]);
 
-        $this->assertEquals($response['headers']['status-code'], 409);
+        $this->assertEquals($response['headers']['status-code'], 400);
 
         /**
          * Test for SUCCESS