check alternative ip notatino

application/Espo/Core/Utils/Security/HostCheck.php

@@ -50,6 +50,12 @@ class HostCheck
             return $this->ipAddressIsNotInternal($host);
         }
 
+        $normalized = $this->normalizeIpAddress($host);
+
+        if ($normalized !== false && filter_var($normalized, FILTER_VALIDATE_IP)) {
+            return false;
+        }
+
         if (!filter_var($host, FILTER_VALIDATE_DOMAIN, FILTER_FLAG_HOSTNAME)) {
             return false;
         }
@@ -93,4 +99,60 @@ class HostCheck
     {
         return $this->isHostAndNotInternal($host);
     }
+
+    private function normalizeIpAddress(string $ip): string|false
+    {
+        if (!str_contains($ip, '.')) {
+            return self::normalizePart($ip);
+        }
+
+        $parts = explode('.', $ip);
+
+        if (count($parts) !== 4) {
+            return false;
+        }
+
+        $result = [];
+
+        foreach ($parts as $part) {
+            if (preg_match('/^0x[0-9a-f]+$/i', $part)) {
+                $num = hexdec($part);
+            } else if (preg_match('/^0[0-7]+$/', $part) && $part !== '0') {
+                $num = octdec($part);
+            } else if (ctype_digit($part)) {
+                $num = (int)$part;
+            } else {
+                return false;
+            }
+
+            if ($num < 0 || $num > 255) {
+                return false;
+            }
+
+            $result[] = $num;
+        }
+
+        return implode('.', $result);
+    }
+
+    private static function normalizePart(string $ip): string|false
+    {
+        if (preg_match('/^0x[0-9a-f]+$/i', $ip)) {
+            $num = hexdec($ip);
+        } elseif (preg_match('/^0[0-7]+$/', $ip) && $ip !== '0') {
+            $num = octdec($ip);
+        } elseif (ctype_digit($ip)) {
+            $num = (int) $ip;
+        } else {
+            return false;
+        }
+
+        if ($num < 0 || $num > 0xFFFFFFFF) {
+            return false;
+        }
+
+        $num = (int) $num;
+
+        return long2ip($num);
+    }
 }

tests/unit/Espo/Core/Utils/Security/HostCheckTest.php

@@ -0,0 +1,65 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2026 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 tests\unit\Espo\Core\Utils\Security;
+
+use Espo\Core\Utils\Security\HostCheck;
+use PHPUnit\Framework\TestCase;
+
+class HostCheckTest extends TestCase
+{
+    public function testIsHostAndNotInternal(): void
+    {
+        $hostCheck = new HostCheck();
+
+        $this->assertTrue(
+            $hostCheck->isHostAndNotInternal('200.1.1.1')
+        );
+
+        $this->assertFalse(
+            $hostCheck->isHostAndNotInternal('172.20.0.1')
+        );
+
+        $this->assertFalse(
+            $hostCheck->isHostAndNotInternal('0177.0.0.1')
+        );
+
+        /*$this->assertFalse(
+            $hostCheck->isHostAndNotInternal('127.1')
+        );
+
+        $this->assertFalse(
+            $hostCheck->isHostAndNotInternal('127.0.1')
+        );*/
+
+        $this->assertFalse(
+            $hostCheck->isHostAndNotInternal('0x7f000001')
+        );
+    }
+}