diff --git a/src/Config.py b/src/Config.py
index 8a847bf3..ba519a6b 100644
--- a/src/Config.py
+++ b/src/Config.py
@@ -241,6 +241,7 @@ class Config:
         self.parser.add_argument('--log-rotate-backup-count', help='Log rotate backup count', default=5, type=int)
 
         self.parser.add_argument('--language', help='Web interface language', default=language, metavar='language')
+        self.parser.add_argument('--ui-ip-protect', help="Protect UI server from being accessed through third-party pages and on unauthorized cross-origin pages (enabled by default when serving on localhost IPs; doesn't work with non-local IPs, need testing with host names)", choices=['always', 'local', 'off'], default='local')
         self.parser.add_argument('--ui-ip', help='Web interface bind address', default="127.0.0.1", metavar='ip')
         self.parser.add_argument('--ui-port', help='Web interface bind port', default=43110, type=int, metavar='port')
         self.parser.add_argument('--ui-site-port', help='Port for serving site content, defaults to ui_port+1', default=None, metavar='port')
@@ -459,6 +460,14 @@ class Config:
             self.arguments = self.parser.parse_args(argv[1:])
         if self.arguments.ui_site_port is None:
             self.arguments.ui_site_port = self.arguments.ui_port + 1
+        if self.arguments.ui_ip_protect == 'always':
+            self.arguments.ui_check_cors = True
+        elif self.arguments.ui_ip_protect == 'off':
+            self.arguments.ui_check_cors = False
+        elif self.arguments.ui_ip_protect == 'local':
+            self.arguments.ui_check_cors = self.arguments.ui_ip == '127.0.0.1' or self.arguments.ui_ip == '::1'
+        else:
+            raise Exception("Wrong argparse result")
 
     def parseConfig(self, argv):
         argv = self.fixArgs(argv)
diff --git a/src/Ui/UiRequest.py b/src/Ui/UiRequest.py
index 34af96e2..70470dba 100644
--- a/src/Ui/UiRequest.py
+++ b/src/Ui/UiRequest.py
@@ -82,7 +82,7 @@ class UiRequest:
             self.learnHost(host)
             return True
 
-        if ":" in host and helper.isIp(host.rsplit(":", 1)[0]):  # Test without port
+        if ":" in host and helper.isIp(host.rsplit(":", 1)[0].lstrip("[").rstrip("]")):  # Test without port
             self.learnHost(host)
             return True
 
@@ -165,14 +165,14 @@ class UiRequest:
         is_navigate = self.env.get('HTTP_SEC_FETCH_MODE') == 'navigate'
         is_iframe = self.env.get('HTTP_SEC_FETCH_DEST') == 'iframe'
 
-        if is_navigate and not is_iframe and self.is_data_request:
+        if ((is_navigate and not is_iframe) or not config.ui_check_cors) and self.is_data_request:
             host = self.getHostWithoutPort()
             path_info = self.env['PATH_INFO']
             query_string = self.env['QUERY_STRING']
             protocol = self.env['wsgi.url_scheme']
             return self.actionRedirect(f'{protocol}://{host}:{config.ui_port}{path_info}?{query_string}')
 
-        if self.isCrossOriginRequest():
+        if config.ui_check_cors and self.isCrossOriginRequest():
             # we are still exposed by answering on port
             self.log.warning('Cross-origin request detected. Someone might be trying to analyze your 0net usage')
             return []
@@ -382,10 +382,12 @@ class UiRequest:
             port = int(self.env['SERVER_PORT'])
             if port == config.ui_port:
                 other_port = config.ui_site_port
+                frame_src = '*'
             else:
                 other_port = config.ui_port
-            site_server = f'{host}:{other_port}'
-            headers["Content-Security-Policy"] = f"default-src 'none'; script-src 'nonce-{script_nonce}'; img-src 'self' blob: data:; style-src 'self' blob: 'unsafe-inline'; connect-src *; frame-src {site_server}"
+                frame_src = 'self'
+
+            headers["Content-Security-Policy"] = f"default-src 'none'; script-src 'nonce-{script_nonce}'; img-src 'self' blob: data:; style-src 'self' blob: 'unsafe-inline'; connect-src *; frame-src {frame_src}"
 
         if allow_ajax:
             headers["Access-Control-Allow-Origin"] = "null"
diff --git a/src/util/helper.py b/src/util/helper.py
index af65f727..8c7c6fff 100644
--- a/src/util/helper.py
+++ b/src/util/helper.py
@@ -325,7 +325,10 @@ def openBrowser(agent):
     if agent and agent != "False":
         print(f"Opening browser: {agent}...")
         ui_ip = config.ui_ip if config.ui_ip != "*" else "127.0.0.1"
-        url = f'http://{ui_ip}:{config.ui_port}/{config.homepage}'
+        if ':' in ui_ip: # IPv6
+            url = f'http://[{ui_ip}]:{config.ui_port}/{config.homepage}'
+        else: # IPv4
+            url = f'http://{ui_ip}:{config.ui_port}/{config.homepage}'
         try:
             import subprocess
             return subprocess.Popen([config.open_browser, url])