diff --git a/frontend/src/App.vue b/frontend/src/App.vue
index 3fb8f8f..9876eab 100644
--- a/frontend/src/App.vue
+++ b/frontend/src/App.vue
@@ -15,6 +15,7 @@
       <button class="icon-btn" @click="openAddGuest">
         <img class="icon" src="/icons/guest.svg" alt="invitado"> Invitado
       </button>
+      <UserDropdown />
       <div class="dropdown">
         <button class="icon-btn" @click="toggleSettingsMenu">
           <img class="icon" src="/icons/settings.svg" alt="config"> Configuración
@@ -172,6 +173,7 @@ import RawDbViewer from './components/RawDbViewer.vue';
 import VlanForm from './components/VlanForm.vue';
 import DeviceForm from './components/DeviceForm.vue';
 import Toast from './components/Toast.vue';
+import UserDropdown from './components/auth/UserDropdown.vue';
 import { createToastSystem, useToast } from './composables/useToast.js';
 
 // Initialize toast system
diff --git a/frontend/src/components/auth/GroupCheckButton.vue b/frontend/src/components/auth/GroupCheckButton.vue
new file mode 100644
index 0000000..d246e95
--- /dev/null
+++ b/frontend/src/components/auth/GroupCheckButton.vue
@@ -0,0 +1,100 @@
+<template>
+  <button
+    class="icon-btn group-check-btn"
+    :class="{ loading: loading }"
+    :disabled="loading"
+    @click="handleClick"
+  >
+    <img v-if="icon" class="icon" :src="icon" :alt="label" />
+    <slot>{{ label }}</slot>
+  </button>
+</template>
+
+<script setup>
+import { ref, defineProps } from 'vue';
+import { useAuthentik } from '../../composables/useAuthentik.js';
+import { useToast } from '../../composables/useToast.js';
+
+const props = defineProps({
+  groupName: {
+    type: String,
+    required: true
+  },
+  label: {
+    type: String,
+    default: 'Verificar Grupo'
+  },
+  icon: {
+    type: String,
+    default: null
+  },
+  verifyBackend: {
+    type: Boolean,
+    default: false
+  }
+});
+
+const { hasGroup, checkGroupBackend } = useAuthentik();
+const { toast } = useToast();
+const loading = ref(false);
+
+const handleClick = async () => {
+  loading.value = true;
+
+  try {
+    if (props.verifyBackend) {
+      // Verificación backend
+      const hasAccess = await checkGroupBackend(props.groupName);
+
+      if (hasAccess) {
+        toast.success('Acceso Permitido (Backend)', {
+          description: `Perteneces al grupo: ${props.groupName}`,
+        });
+      } else {
+        toast.error('Acceso Denegado (Backend)', {
+          description: `No perteneces al grupo: ${props.groupName}`,
+        });
+      }
+    } else {
+      // Verificación frontend
+      const hasAccess = hasGroup(props.groupName);
+
+      if (hasAccess) {
+        toast.success('Acceso Permitido (Frontend)', {
+          description: `Perteneces al grupo: ${props.groupName}`,
+        });
+      } else {
+        toast.error('Acceso Denegado (Frontend)', {
+          description: `No perteneces al grupo: ${props.groupName}`,
+        });
+      }
+    }
+  } catch (error) {
+    toast.error('Error de Verificación', {
+      description: 'No se pudo verificar el grupo',
+    });
+    console.error('Group check error:', error);
+  } finally {
+    loading.value = false;
+  }
+};
+</script>
+
+<style scoped>
+.group-check-btn {
+  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
+}
+
+.group-check-btn:hover:not(:disabled) {
+  transform: translateY(-2px);
+}
+
+.group-check-btn:active:not(:disabled) {
+  transform: translateY(0);
+}
+
+.group-check-btn.loading {
+  opacity: 0.6;
+  cursor: wait;
+}
+</style>
diff --git a/frontend/src/components/auth/SessionStatusButton.vue b/frontend/src/components/auth/SessionStatusButton.vue
new file mode 100644
index 0000000..126f2b6
--- /dev/null
+++ b/frontend/src/components/auth/SessionStatusButton.vue
@@ -0,0 +1,22 @@
+<template>
+  <button class="icon-btn session-status-btn" @click="handleClick">
+    <img class="icon" src="/icons/settings.svg" alt="info" />
+    Estado de Sesión
+  </button>
+</template>
+
+<script setup>
+import { useAuthentik } from '../../composables/useAuthentik.js';
+
+const { checkSessionStatus } = useAuthentik();
+
+const handleClick = () => {
+  checkSessionStatus();
+};
+</script>
+
+<style scoped>
+.session-status-btn {
+  /* Heredar estilos de .icon-btn del CSS global */
+}
+</style>
diff --git a/frontend/src/components/auth/UserAvatar.vue b/frontend/src/components/auth/UserAvatar.vue
new file mode 100644
index 0000000..812ca63
--- /dev/null
+++ b/frontend/src/components/auth/UserAvatar.vue
@@ -0,0 +1,41 @@
+<template>
+  <div v-if="user" class="user-avatar-container">
+    <img
+      :src="user.avatar"
+      :alt="user.name || user.username"
+      class="user-avatar"
+    />
+  </div>
+</template>
+
+<script setup>
+import { defineProps } from 'vue';
+
+defineProps({
+  user: {
+    type: Object,
+    required: true
+  }
+});
+</script>
+
+<style scoped>
+.user-avatar-container {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.user-avatar {
+  width: 32px;
+  height: 32px;
+  border-radius: 50%;
+  object-fit: cover;
+  border: 2px solid rgba(var(--border));
+  transition: transform 0.2s ease;
+}
+
+.user-avatar:hover {
+  transform: scale(1.05);
+}
+</style>
diff --git a/frontend/src/components/auth/UserDropdown.vue b/frontend/src/components/auth/UserDropdown.vue
new file mode 100644
index 0000000..68ded65
--- /dev/null
+++ b/frontend/src/components/auth/UserDropdown.vue
@@ -0,0 +1,254 @@
+<template>
+  <div class="user-dropdown-container">
+    <!-- Loading state -->
+    <div v-if="isLoading" class="chip">
+      <span class="muted">Cargando...</span>
+    </div>
+
+    <!-- Not authenticated -->
+    <div v-else-if="!isAuthenticated" class="chip">
+      <span class="muted">No autenticado</span>
+    </div>
+
+    <!-- Authenticated - Show dropdown -->
+    <div v-else class="dropdown">
+      <button class="user-dropdown-trigger icon-btn" @click="toggleMenu">
+        <UserAvatar :user="user" />
+        <span class="user-name">{{ user.name || user.username }}</span>
+      </button>
+
+      <div v-if="isMenuOpen" class="menu user-menu">
+        <!-- User Info -->
+        <div class="menu-section user-info">
+          <UserAvatar :user="user" />
+          <div class="user-details">
+            <div class="user-full-name">{{ user.name || user.username }}</div>
+            <div class="user-email muted">{{ user.email }}</div>
+          </div>
+        </div>
+
+        <hr class="menu-divider" />
+
+        <!-- User Metadata -->
+        <div class="menu-section metadata-section">
+          <div class="metadata-item" v-if="user.uid">
+            <span class="muted">ID:</span>
+            <span class="metadata-value">{{ user.uid }}</span>
+          </div>
+          <div class="metadata-item" v-if="user.groups && user.groups.length > 0">
+            <span class="muted">Grupos:</span>
+            <div class="groups-list">
+              <span
+                v-for="group in user.groups"
+                :key="group"
+                class="chip group-chip"
+              >
+                {{ group }}
+              </span>
+            </div>
+          </div>
+        </div>
+
+        <hr class="menu-divider" />
+
+        <!-- Actions -->
+        <div class="menu-section">
+          <button class="menu-item-btn" @click="handleGoToProfile">
+            <img class="icon" src="/icons/user-plus.svg" alt="perfil" />
+            Ver Perfil en Authentik
+          </button>
+
+          <button class="menu-item-btn" @click="handleCheckSession">
+            <img class="icon" src="/icons/settings.svg" alt="info" />
+            Verificar Sesión
+          </button>
+
+          <button class="menu-item-btn logout-btn" @click="handleLogout">
+            <span class="icon">⎋</span>
+            Cerrar Sesión
+          </button>
+        </div>
+      </div>
+    </div>
+  </div>
+</template>
+
+<script setup>
+import { ref, onMounted } from 'vue';
+import { useAuthentik } from '../../composables/useAuthentik.js';
+import UserAvatar from './UserAvatar.vue';
+
+const {
+  user,
+  isAuthenticated,
+  isLoading,
+  fetchUserData,
+  logout,
+  goToProfile,
+  checkSessionStatus,
+} = useAuthentik();
+
+const isMenuOpen = ref(false);
+
+const toggleMenu = () => {
+  isMenuOpen.value = !isMenuOpen.value;
+};
+
+const handleLogout = () => {
+  isMenuOpen.value = false;
+  logout();
+};
+
+const handleGoToProfile = () => {
+  isMenuOpen.value = false;
+  goToProfile();
+};
+
+const handleCheckSession = () => {
+  isMenuOpen.value = false;
+  checkSessionStatus();
+};
+
+// Cerrar el menú al hacer click fuera
+const handleClickOutside = (event) => {
+  const dropdown = event.target.closest('.user-dropdown-container');
+  if (!dropdown) {
+    isMenuOpen.value = false;
+  }
+};
+
+onMounted(() => {
+  // Cargar datos del usuario al montar
+  fetchUserData();
+
+  // Agregar listener para cerrar menú al hacer click fuera
+  document.addEventListener('click', handleClickOutside);
+});
+
+// Cleanup
+import { onUnmounted } from 'vue';
+onUnmounted(() => {
+  document.removeEventListener('click', handleClickOutside);
+});
+</script>
+
+<style scoped>
+.user-dropdown-container {
+  position: relative;
+}
+
+.user-dropdown-trigger {
+  display: inline-flex;
+  align-items: center;
+  gap: 8px;
+  cursor: pointer;
+}
+
+.user-name {
+  font-size: 14px;
+  font-weight: 500;
+}
+
+.user-menu {
+  min-width: 280px;
+  max-width: 320px;
+}
+
+.menu-section {
+  padding: 8px;
+}
+
+.user-info {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+  padding: 12px 8px;
+}
+
+.user-details {
+  flex: 1;
+  min-width: 0;
+}
+
+.user-full-name {
+  font-weight: 600;
+  font-size: 14px;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.user-email {
+  font-size: 12px;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.menu-divider {
+  border: none;
+  border-top: 1px solid rgba(var(--border));
+  margin: 4px 0;
+}
+
+.metadata-section {
+  display: flex;
+  flex-direction: column;
+  gap: 8px;
+}
+
+.metadata-item {
+  display: flex;
+  flex-direction: column;
+  gap: 4px;
+  font-size: 12px;
+}
+
+.metadata-value {
+  font-family: monospace;
+  font-size: 11px;
+  word-break: break-all;
+}
+
+.groups-list {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 4px;
+}
+
+.group-chip {
+  font-size: 11px;
+  padding: 2px 6px;
+  background: rgba(var(--accent), 0.1);
+  border-color: rgba(var(--accent), 0.3);
+}
+
+.menu-item-btn {
+  width: 100%;
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  padding: 8px 10px;
+  border-radius: 8px;
+  border: 1px solid rgba(var(--border));
+  background: rgba(var(--card));
+  color: inherit;
+  cursor: pointer;
+  transition: background 0.2s, transform 0.1s;
+  font-size: 13px;
+}
+
+.menu-item-btn:hover {
+  background: rgba(255, 255, 255, 0.06);
+  transform: translateX(2px);
+}
+
+.logout-btn {
+  border-color: rgba(255, 100, 100, 0.3);
+  color: rgb(255, 120, 120);
+}
+
+.logout-btn:hover {
+  background: rgba(255, 100, 100, 0.1);
+}
+</style>
diff --git a/frontend/src/composables/useAuthentik.js b/frontend/src/composables/useAuthentik.js
new file mode 100644
index 0000000..3e28823
--- /dev/null
+++ b/frontend/src/composables/useAuthentik.js
@@ -0,0 +1,147 @@
+import { ref, computed } from 'vue';
+import { AUTHENTIK_ENDPOINTS, AVATAR_CONFIG } from '../config/auth.js';
+import { useToast } from './useToast.js';
+
+/**
+ * Composable para gestionar autenticación con Authentik
+ * Adaptado de plantillaNuxtAuthentikProxy para Vue 3 vanilla
+ */
+
+// Estado global del usuario (singleton)
+const authentikUser = ref(null);
+const isLoading = ref(false);
+
+export function useAuthentik() {
+  const { toast } = useToast();
+
+  /**
+   * Obtener datos del usuario desde el backend
+   * El backend lee los headers inyectados por Authentik Proxy Outpost
+   */
+  const fetchUserData = async () => {
+    isLoading.value = true;
+    try {
+      const response = await fetch('/api/auth/status');
+      const data = await response.json();
+
+      if (data.authenticated && data.user) {
+        // Generar avatar URL usando UI Avatars
+        const avatarName = encodeURIComponent(data.user.name || data.user.username);
+        data.user.avatar = `${AVATAR_CONFIG.provider}?name=${avatarName}&background=${AVATAR_CONFIG.background}&size=${AVATAR_CONFIG.defaultSize}`;
+
+        authentikUser.value = data.user;
+      } else {
+        authentikUser.value = null;
+      }
+    } catch (error) {
+      console.error('Error fetching user data:', error);
+      authentikUser.value = null;
+    } finally {
+      isLoading.value = false;
+    }
+  };
+
+  /**
+   * Cerrar sesión en Authentik
+   * Redirige a la URL de invalidación de sesión
+   */
+  const logout = () => {
+    window.location.href = AUTHENTIK_ENDPOINTS.logout;
+  };
+
+  /**
+   * Ir al perfil de usuario en Authentik
+   */
+  const goToProfile = () => {
+    window.open(AUTHENTIK_ENDPOINTS.profile, '_blank');
+  };
+
+  /**
+   * Verificar el estado de la sesión contra el backend
+   */
+  const checkSessionStatus = async () => {
+    // Verificar si está offline primero
+    if (!navigator.onLine) {
+      toast.info('Modo Offline', {
+        description: 'No se puede validar sesión sin conexión',
+      });
+      return;
+    }
+
+    // Mostrar toast de "verificando..."
+    toast.info('Verificando sesión...', {
+      description: 'Consultando estado en Authentik',
+    });
+
+    try {
+      const response = await fetch('/api/auth/status');
+      const data = await response.json();
+
+      if (data.authenticated && data.user) {
+        // Sesión activa en Authentik
+        toast.success('Sesión Activa', {
+          description: `Conectado como: ${data.user.name || data.user.username}`,
+        });
+      } else {
+        // Sin sesión en Authentik
+        toast.warning('Sin Sesión', {
+          description: 'No hay sesión activa en Authentik. Recarga la página para autenticarte.',
+        });
+      }
+    } catch (error) {
+      // Verificar si está offline ahora (pudo desconectarse durante la petición)
+      if (!navigator.onLine) {
+        toast.info('Modo Offline', {
+          description: 'No se puede validar sesión sin conexión',
+        });
+        return;
+      }
+
+      // Error de red o servidor
+      toast.error('Error', {
+        description: 'No se pudo verificar el estado de la sesión',
+      });
+      console.error('Error checking session status:', error);
+    }
+  };
+
+  /**
+   * Verifica si el usuario pertenece a un grupo específico (frontend)
+   * Lee los grupos desde el estado local
+   */
+  const hasGroup = (groupName) => {
+    if (!authentikUser.value) return false;
+    return authentikUser.value.groups.includes(groupName);
+  };
+
+  /**
+   * Verifica si el usuario pertenece a un grupo específico (backend)
+   * Consulta al servidor para validar contra Authentik
+   */
+  const checkGroupBackend = async (groupName) => {
+    try {
+      const response = await fetch('/api/auth/check-group', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ groupName })
+      });
+      const data = await response.json();
+      return data.hasGroup || false;
+    } catch (error) {
+      console.error('Error checking group membership:', error);
+      return false;
+    }
+  };
+
+  return {
+    user: computed(() => authentikUser.value),
+    isAuthenticated: computed(() => !!authentikUser.value),
+    isLoading: computed(() => isLoading.value),
+    fetchUserData,
+    logout,
+    goToProfile,
+    checkSessionStatus,
+    hasGroup,
+    checkGroupBackend,
+  };
+}
diff --git a/frontend/src/config/auth.js b/frontend/src/config/auth.js
new file mode 100644
index 0000000..4827017
--- /dev/null
+++ b/frontend/src/config/auth.js
@@ -0,0 +1,19 @@
+/**
+ * Configuración de autenticación Authentik
+ */
+
+// URL base de Authentik (se puede configurar desde variable de entorno)
+export const AUTHENTIK_URL = import.meta.env.VITE_AUTHENTIK_URL || 'https://authentik.nucleoriofrio.com';
+
+// Endpoints de Authentik
+export const AUTHENTIK_ENDPOINTS = {
+  logout: `${AUTHENTIK_URL}/flows/-/default/invalidation/`,
+  profile: `${AUTHENTIK_URL}/if/user/`,
+};
+
+// Configuración de avatar
+export const AVATAR_CONFIG = {
+  provider: 'https://ui-avatars.com/api/',
+  defaultSize: 128,
+  background: 'random',
+};
diff --git a/node-api/src/app.js b/node-api/src/app.js
index 955c1fc..d766975 100644
--- a/node-api/src/app.js
+++ b/node-api/src/app.js
@@ -4,6 +4,7 @@ import path from 'path';
 import { fileURLToPath } from 'url';
 import apiRouter from './routes/api.js';
 import radiusRouter from './routes/radius.js';
+import authRouter from './routes/auth.js';
 
 export function createApp() {
   const app = express();
@@ -20,6 +21,9 @@ export function createApp() {
   // REST API
   app.use('/api', apiRouter);
 
+  // Auth API
+  app.use('/api/auth', authRouter);
+
   // Simple health endpoint for reverse proxies / checks
   app.get('/healthz', (_req, res) => res.json({ ok: true }));
 
diff --git a/node-api/src/routes/auth.js b/node-api/src/routes/auth.js
new file mode 100644
index 0000000..21da43a
--- /dev/null
+++ b/node-api/src/routes/auth.js
@@ -0,0 +1,90 @@
+import { Router } from 'express';
+
+const router = Router();
+
+/**
+ * Endpoint para verificar el estado de autenticación en tiempo real
+ * Consulta los headers inyectados por Authentik Proxy Outpost
+ */
+router.get('/status', (req, res) => {
+  // Establecer headers para prevenir caching
+  res.setHeader('Cache-Control', 'no-store, no-cache, must-revalidate, proxy-revalidate');
+  res.setHeader('Pragma', 'no-cache');
+  res.setHeader('Expires', '0');
+
+  // Leer headers de Authentik en tiempo real
+  const headers = req.headers;
+
+  const username = headers['x-authentik-username'];
+  const email = headers['x-authentik-email'];
+  const name = headers['x-authentik-name'];
+  const groups = headers['x-authentik-groups'];
+  const uid = headers['x-authentik-uid'];
+  const appSlug = headers['x-authentik-meta-app'];
+  const outpostName = headers['x-authentik-meta-outpost'];
+
+  // Si no hay username, no hay sesión activa en Authentik
+  if (!username) {
+    return res.json({
+      authenticated: false,
+      user: null,
+      timestamp: new Date().toISOString()
+    });
+  }
+
+  // Sesión activa
+  res.json({
+    authenticated: true,
+    user: {
+      username,
+      email,
+      name,
+      groups: groups ? groups.split('|').filter(g => g.trim()) : [],
+      uid,
+      appSlug,
+      outpostName
+    },
+    timestamp: new Date().toISOString()
+  });
+});
+
+/**
+ * Endpoint para verificar membresía de grupo desde el backend
+ * Valida contra los headers de Authentik en el servidor
+ */
+router.post('/check-group', (req, res) => {
+  const { groupName } = req.body || {};
+
+  if (!groupName || typeof groupName !== 'string') {
+    return res.status(400).json({
+      ok: false,
+      error: 'Group name is required'
+    });
+  }
+
+  // Leer headers de Authentik
+  const headers = req.headers;
+  const authentikGroups = headers['x-authentik-groups'];
+
+  // Si no hay header de grupos, el usuario no está autenticado o no tiene grupos
+  if (!authentikGroups) {
+    return res.json({
+      hasGroup: false,
+      groups: []
+    });
+  }
+
+  // Parsear los grupos (separados por |)
+  const userGroups = authentikGroups.split('|').filter(g => g.trim());
+
+  // Verificar si el usuario tiene el grupo solicitado
+  const hasGroup = userGroups.includes(groupName);
+
+  res.json({
+    hasGroup,
+    groups: userGroups,
+    checkedGroup: groupName
+  });
+});
+
+export default router;