diff --git a/application/Espo/Core/Api/Auth.php b/application/Espo/Core/Api/Auth.php
index a62dae3745..8aaacc7e4d 100644
--- a/application/Espo/Core/Api/Auth.php
+++ b/application/Espo/Core/Api/Auth.php
@@ -112,7 +112,8 @@ class Auth
 
         $showDialog =
             ($this->isEntryPoint || !$this->isXMLHttpRequest($request)) &&
-            !$request->getHeader('Referer');
+            !$request->getHeader('Referer') &&
+            $request->getMethod() !== Method::POST;
 
         $this->handleUnauthorized($response, null, $showDialog);
 
@@ -167,7 +168,8 @@ class Auth
         if ($result->isFail()) {
             $showDialog =
                 $this->isEntryPoint &&
-                !$request->getHeader('Referer');
+                !$request->getHeader('Referer') &&
+                $request->getMethod() !== Method::POST;
 
             $this->handleUnauthorized($response, $result, $showDialog);
         }
diff --git a/application/Espo/Core/Api/Method.php b/application/Espo/Core/Api/Method.php
new file mode 100644
index 0000000000..37c0027b8d
--- /dev/null
+++ b/application/Espo/Core/Api/Method.php
@@ -0,0 +1,47 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2025 EspoCRM, Inc.
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Core\Api;
+
+/**
+ * @since 9.2.0
+ */
+class Method
+{
+    public const HEAD = 'HEAD';
+    public const GET = 'GET';
+    public const POST = 'POST';
+    public const PUT = 'PUT';
+    public const PATCH = 'PATCH';
+    public const DELETE = 'DELETE';
+    public const PURGE = 'PURGE';
+    public const OPTIONS = 'OPTIONS';
+    public const TRACE = 'TRACE';
+    public const CONNECT = 'CONNECT';
+}