diff --git a/Jellyfin.Api/Auth/FirstTimeSetupPolicy/FirstTimeSetupHandler.cs b/Jellyfin.Api/Auth/FirstTimeSetupPolicy/FirstTimeSetupHandler.cs
index 28ba258503..688a13bc0b 100644
--- a/Jellyfin.Api/Auth/FirstTimeSetupPolicy/FirstTimeSetupHandler.cs
+++ b/Jellyfin.Api/Auth/FirstTimeSetupPolicy/FirstTimeSetupHandler.cs
@@ -38,7 +38,15 @@ namespace Jellyfin.Api.Auth.FirstTimeSetupPolicy
                 return Task.CompletedTask;
             }
 
-            if (requirement.RequireAdmin && !context.User.IsInRole(UserRoles.Administrator))
+            var contextUser = context.User;
+            if (requirement.RequireAdmin && !contextUser.IsInRole(UserRoles.Administrator))
+            {
+                context.Fail();
+                return Task.CompletedTask;
+            }
+
+            var userId = contextUser.GetUserId();
+            if (userId.Equals(default))
             {
                 context.Fail();
                 return Task.CompletedTask;
@@ -50,7 +58,7 @@ namespace Jellyfin.Api.Auth.FirstTimeSetupPolicy
                 return Task.CompletedTask;
             }
 
-            var user = _userManager.GetUserById(context.User.GetUserId());
+            var user = _userManager.GetUserById(userId);
             if (user is null)
             {
                 throw new ResourceNotFoundException();
diff --git a/Jellyfin.Api/Controllers/SystemController.cs b/Jellyfin.Api/Controllers/SystemController.cs
index 4ab705f40a..9ed69f4205 100644
--- a/Jellyfin.Api/Controllers/SystemController.cs
+++ b/Jellyfin.Api/Controllers/SystemController.cs
@@ -59,10 +59,12 @@ public class SystemController : BaseJellyfinApiController
     /// Gets information about the server.
     /// </summary>
     /// <response code="200">Information retrieved.</response>
+    /// <response code="403">User does not have permission to retrieve information.</response>
     /// <returns>A <see cref="SystemInfo"/> with info about the system.</returns>
     [HttpGet("Info")]
     [Authorize(Policy = Policies.FirstTimeSetupOrIgnoreParentalControl)]
     [ProducesResponseType(StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status403Forbidden)]
     public ActionResult<SystemInfo> GetSystemInfo()
     {
         return _appHost.GetSystemInfo(Request);
@@ -97,10 +99,12 @@ public class SystemController : BaseJellyfinApiController
     /// Restarts the application.
     /// </summary>
     /// <response code="204">Server restarted.</response>
+    /// <response code="403">User does not have permission to restart server.</response>
     /// <returns>No content. Server restarted.</returns>
     [HttpPost("Restart")]
     [Authorize(Policy = Policies.LocalAccessOrRequiresElevation)]
     [ProducesResponseType(StatusCodes.Status204NoContent)]
+    [ProducesResponseType(StatusCodes.Status403Forbidden)]
     public ActionResult RestartApplication()
     {
         Task.Run(async () =>
@@ -115,10 +119,12 @@ public class SystemController : BaseJellyfinApiController
     /// Shuts down the application.
     /// </summary>
     /// <response code="204">Server shut down.</response>
+    /// <response code="403">User does not have permission to shutdown server.</response>
     /// <returns>No content. Server shut down.</returns>
     [HttpPost("Shutdown")]
     [Authorize(Policy = Policies.RequiresElevation)]
     [ProducesResponseType(StatusCodes.Status204NoContent)]
+    [ProducesResponseType(StatusCodes.Status403Forbidden)]
     public ActionResult ShutdownApplication()
     {
         Task.Run(async () =>
@@ -133,10 +139,12 @@ public class SystemController : BaseJellyfinApiController
     /// Gets a list of available server log files.
     /// </summary>
     /// <response code="200">Information retrieved.</response>
+    /// <response code="403">User does not have permission to get server logs.</response>
     /// <returns>An array of <see cref="LogFile"/> with the available log files.</returns>
     [HttpGet("Logs")]
     [Authorize(Policy = Policies.RequiresElevation)]
     [ProducesResponseType(StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status403Forbidden)]
     public ActionResult<LogFile[]> GetServerLogs()
     {
         IEnumerable<FileSystemMetadata> files;
@@ -170,10 +178,12 @@ public class SystemController : BaseJellyfinApiController
     /// Gets information about the request endpoint.
     /// </summary>
     /// <response code="200">Information retrieved.</response>
+    /// <response code="403">User does not have permission to get endpoint information.</response>
     /// <returns><see cref="EndPointInfo"/> with information about the endpoint.</returns>
     [HttpGet("Endpoint")]
     [Authorize]
     [ProducesResponseType(StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status403Forbidden)]
     public ActionResult<EndPointInfo> GetEndpointInfo()
     {
         return new EndPointInfo
@@ -188,10 +198,12 @@ public class SystemController : BaseJellyfinApiController
     /// </summary>
     /// <param name="name">The name of the log file to get.</param>
     /// <response code="200">Log file retrieved.</response>
+    /// <response code="403">User does not have permission to get log files.</response>
     /// <returns>The log file.</returns>
     [HttpGet("Logs/Log")]
     [Authorize(Policy = Policies.RequiresElevation)]
     [ProducesResponseType(StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status403Forbidden)]
     [ProducesFile(MediaTypeNames.Text.Plain)]
     public ActionResult GetLogFile([FromQuery, Required] string name)
     {