diff --git a/Minecraft-Realms-Emulator/Attributes/RequireMinecraftCookieAttribute.cs b/Minecraft-Realms-Emulator/Attributes/RequireMinecraftCookieAttribute.cs
new file mode 100644
index 0000000..6bf810f
--- /dev/null
+++ b/Minecraft-Realms-Emulator/Attributes/RequireMinecraftCookieAttribute.cs
@@ -0,0 +1,15 @@
+namespace Minecraft_Realms_Emulator.Attributes
+{
+    [AttributeUsage(AttributeTargets.Class)]
+    public class RequireMinecraftCookieAttribute : Attribute
+    {
+        public RequireMinecraftCookieAttribute()
+        {
+        }
+
+        public bool HasMinecraftCookie(string cookie)
+        {
+            return cookie.Contains("sid") && cookie.Contains("user") && cookie.Contains("version");
+        }
+    }
+}
diff --git a/Minecraft-Realms-Emulator/Controllers/InvitesController.cs b/Minecraft-Realms-Emulator/Controllers/InvitesController.cs
index c51f24a..76ca189 100644
--- a/Minecraft-Realms-Emulator/Controllers/InvitesController.cs
+++ b/Minecraft-Realms-Emulator/Controllers/InvitesController.cs
@@ -1,5 +1,6 @@
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.EntityFrameworkCore;
+using Minecraft_Realms_Emulator.Attributes;
 using Minecraft_Realms_Emulator.Data;
 using Minecraft_Realms_Emulator.Entities;
 using Minecraft_Realms_Emulator.Requests;
@@ -9,6 +10,7 @@ namespace Minecraft_Realms_Emulator.Controllers
 {
     [Route("[controller]")]
     [ApiController]
+    [RequireMinecraftCookie]
     public class InvitesController : ControllerBase
     {
         private readonly DataContext _context;
diff --git a/Minecraft-Realms-Emulator/Controllers/McoController.cs b/Minecraft-Realms-Emulator/Controllers/McoController.cs
index d4c7ebf..d7583cf 100644
--- a/Minecraft-Realms-Emulator/Controllers/McoController.cs
+++ b/Minecraft-Realms-Emulator/Controllers/McoController.cs
@@ -1,4 +1,5 @@
 using Microsoft.AspNetCore.Mvc;
+using Minecraft_Realms_Emulator.Attributes;
 using Minecraft_Realms_Emulator.Data;
 using Minecraft_Realms_Emulator.Responses;
 
@@ -6,6 +7,7 @@ namespace Minecraft_Realms_Emulator.Controllers
 {
     [Route("[controller]")]
     [ApiController]
+    [RequireMinecraftCookie]
     public class McoController : ControllerBase
     {
         private readonly DataContext _context;
diff --git a/Minecraft-Realms-Emulator/Controllers/OpsController.cs b/Minecraft-Realms-Emulator/Controllers/OpsController.cs
index 93f5b4d..72f1338 100644
--- a/Minecraft-Realms-Emulator/Controllers/OpsController.cs
+++ b/Minecraft-Realms-Emulator/Controllers/OpsController.cs
@@ -1,4 +1,5 @@
 using Microsoft.AspNetCore.Mvc;
+using Minecraft_Realms_Emulator.Attributes;
 using Minecraft_Realms_Emulator.Data;
 using Minecraft_Realms_Emulator.Responses;
 
@@ -6,6 +7,7 @@ namespace Minecraft_Realms_Emulator.Controllers
 {
     [Route("[controller]")]
     [ApiController]
+    [RequireMinecraftCookie]
     public class OpsController : ControllerBase
     {
         private readonly DataContext _context;
diff --git a/Minecraft-Realms-Emulator/Controllers/SubscriptionsController.cs b/Minecraft-Realms-Emulator/Controllers/SubscriptionsController.cs
index 74892a8..e29d145 100644
--- a/Minecraft-Realms-Emulator/Controllers/SubscriptionsController.cs
+++ b/Minecraft-Realms-Emulator/Controllers/SubscriptionsController.cs
@@ -1,5 +1,6 @@
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.EntityFrameworkCore;
+using Minecraft_Realms_Emulator.Attributes;
 using Minecraft_Realms_Emulator.Data;
 using Minecraft_Realms_Emulator.Responses;
 
@@ -7,6 +8,7 @@ namespace Minecraft_Realms_Emulator.Controllers
 {
     [Route("[controller]")]
     [ApiController]
+    [RequireMinecraftCookie]
     public class SubscriptionsController : ControllerBase
     {
         private readonly DataContext _context;
diff --git a/Minecraft-Realms-Emulator/Controllers/TrialController.cs b/Minecraft-Realms-Emulator/Controllers/TrialController.cs
index fdca4a2..b75fb56 100644
--- a/Minecraft-Realms-Emulator/Controllers/TrialController.cs
+++ b/Minecraft-Realms-Emulator/Controllers/TrialController.cs
@@ -1,10 +1,12 @@
 using Microsoft.AspNetCore.Mvc;
+using Minecraft_Realms_Emulator.Attributes;
 using Minecraft_Realms_Emulator.Data;
 
 namespace Minecraft_Realms_Emulator.Controllers
 {
     [Route("[controller]")]
     [ApiController]
+    [RequireMinecraftCookie]
     public class TrialController : ControllerBase
     {
         private readonly DataContext _context;
diff --git a/Minecraft-Realms-Emulator/Controllers/WorldsController.cs b/Minecraft-Realms-Emulator/Controllers/WorldsController.cs
index 2754678..80de8bd 100644
--- a/Minecraft-Realms-Emulator/Controllers/WorldsController.cs
+++ b/Minecraft-Realms-Emulator/Controllers/WorldsController.cs
@@ -1,5 +1,6 @@
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.EntityFrameworkCore;
+using Minecraft_Realms_Emulator.Attributes;
 using Minecraft_Realms_Emulator.Data;
 using Minecraft_Realms_Emulator.Entities;
 
@@ -7,6 +8,7 @@ namespace Minecraft_Realms_Emulator.Controllers
 {
     [Route("[controller]")]
     [ApiController]
+    [RequireMinecraftCookie]
     public class WorldsController : ControllerBase
     {
         private readonly DataContext _context;
diff --git a/Minecraft-Realms-Emulator/Middlewares/MinecraftCookieMiddleware.cs b/Minecraft-Realms-Emulator/Middlewares/MinecraftCookieMiddleware.cs
new file mode 100644
index 0000000..1f34861
--- /dev/null
+++ b/Minecraft-Realms-Emulator/Middlewares/MinecraftCookieMiddleware.cs
@@ -0,0 +1,34 @@
+using Minecraft_Realms_Emulator.Attributes;
+using System.Text;
+
+namespace Minecraft_Realms_Emulator.Middlewares
+{
+    public class MinecraftCookieMiddleware(RequestDelegate next)
+    {
+        private readonly RequestDelegate _next = next;
+
+        public async Task Invoke(HttpContext httpContext)
+        {
+            var endpoint = httpContext.GetEndpoint();
+            var attribute = endpoint?.Metadata.GetMetadata<RequireMinecraftCookieAttribute>();
+
+            if (attribute == null)
+            {
+                await _next(httpContext);
+                return;
+            }
+
+            if (httpContext.Request.Headers.Cookie.ToString() == "")
+            {
+                httpContext.Response.StatusCode = 401;
+                await httpContext.Response.Body.WriteAsync(Encoding.UTF8.GetBytes("Authorization required"));
+                return;
+            }
+
+            string cookie = httpContext.Request.Headers.Cookie.ToString();
+            if (!attribute.HasMinecraftCookie(cookie)) throw new UnauthorizedAccessException("Malformed cookie header");
+
+            await _next(httpContext);
+        }
+    }
+}
diff --git a/Minecraft-Realms-Emulator/Program.cs b/Minecraft-Realms-Emulator/Program.cs
index cb19d23..6ff4cc5 100644
--- a/Minecraft-Realms-Emulator/Program.cs
+++ b/Minecraft-Realms-Emulator/Program.cs
@@ -1,6 +1,7 @@
 using Microsoft.EntityFrameworkCore;
 using Minecraft_Realms_Emulator.Data;
 using Minecraft_Realms_Emulator.Helpers;
+using Minecraft_Realms_Emulator.Middlewares;
 using Npgsql;
 
 var builder = WebApplication.CreateBuilder(args);
@@ -40,7 +41,7 @@ if (app.Environment.IsDevelopment())
     app.UseSwaggerUI();
 }
 
-app.UseAuthorization();
+app.UseMiddleware<MinecraftCookieMiddleware>();
 
 app.MapControllers();