Glances exposes the REST API without authentication

@@ -144,6 +144,49 @@ You can configure JWT settings in the Glances configuration file:
 **Note:** The token endpoint (``/api/4/token``) does not require authentication.
 Protected endpoints support both Bearer token and Basic Auth authentication methods.
 
+.. _security:
+
+Security
+--------
+
+By default, Glances web server runs **without authentication** and binds to
+**all network interfaces** (``0.0.0.0``). This means any client that can reach
+the server on the network can access the full REST API, including sensitive
+system information such as process command-lines, which may contain credentials
+(passwords, API keys, tokens passed as arguments).
+
+This default is intentional for ease of use on private, trusted networks (home
+labs, local machines, internal infrastructure). However, if your Glances
+instance is reachable from untrusted networks, you should take the following
+precautions:
+
+**Enable authentication** by starting Glances with the ``--password`` option:
+
+.. code-block:: bash
+
+    glances -w --password
+
+**Bind to localhost only** if remote access is not needed:
+
+.. code-block:: bash
+
+    glances -w --bind 127.0.0.1
+
+**Use a reverse proxy** (nginx, Caddy, Apache) with TLS and authentication for
+any public-facing or semi-public deployment. This is the recommended approach
+for production environments.
+
+.. code-block:: ini
+
+    # Example: restrict bind to localhost, access via reverse proxy
+    # In glances.conf:
+    [outputs]
+    # Set the bind address to localhost
+    # then configure your reverse proxy to forward to 127.0.0.1:61208
+
+When Glances is started without authentication, a warning message is displayed
+at startup to remind you of the risk.
+
 WebUI refresh
 -------------
 

@@ -533,6 +533,22 @@ def _router(self) -> APIRouter:
         # Logo
         print(self._logo())
 
+        # Security warning if no authentication is configured
+        if not self.args.password:
+            is_localhost = self.args.bind_address in ('127.0.0.1', 'localhost', '::1')
+            warn_lines = [
+                "WARNING: Glances web server is running WITHOUT authentication.",
+            ]
+            if is_localhost:
+                warn_lines.append("         Use --password to enable authentication.")
+            else:
+                warn_lines.append("         Any client on the network can access system information.")
+                warn_lines.append("         Use --password to enable authentication or")
+                warn_lines.append("         --bind 127.0.0.1 to restrict access to localhost.")
+            warn_lines.append("         See https://glances.readthedocs.io/en/latest/api/restful.html#security")
+            print('\n'.join(warn_lines) + '\n')
+            logger.warning("Glances web server is running without authentication")
+
         # Browser WEBUI
         if hasattr(self.args, 'browser') and self.args.browser:
             # Template for the root browser.html file