diff --git a/lib/auth.js b/lib/auth.js
index 325569a..bb3e296 100644
--- a/lib/auth.js
+++ b/lib/auth.js
@@ -5,7 +5,7 @@
 
 const PUBLIC_PATHS = ['/', '/health', '/favicon.ico', '/status'];
 const PUBLIC_API = ['/api/settings', '/api/tools', '/api/content/advantages', '/api/content/dashboard'];
-const PUBLIC_PREFIXES = ['/auth/', '/vendor/', '/placeholder-img/', '/admin', '/status/'];
+const PUBLIC_PREFIXES = ['/auth/', '/vendor/', '/placeholder-img/', '/status/'];
 const PUBLIC_FILES = ['/shared.css', '/shared.js', '/landing.html'];
 
 function authMiddleware(req, res, next) {
diff --git a/package-lock.json b/package-lock.json
index b2a4f4e..9f57e8c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -22,6 +22,7 @@
         "express-rate-limit": "^8.3.0",
         "express-session": "^1.18.1",
         "geoip-lite": "^1.4.10",
+        "helmet": "^8.1.0",
         "iconv-lite": "^0.7.2",
         "jsdom": "^28.1.0",
         "mariadb": "^3.5.2",
@@ -6429,6 +6430,15 @@
         "node": ">= 0.4"
       }
     },
+    "node_modules/helmet": {
+      "version": "8.1.0",
+      "resolved": "https://registry.npmjs.org/helmet/-/helmet-8.1.0.tgz",
+      "integrity": "sha512-jOiHyAZsmnr8LqoPGmCjYAaiuWwjAPLgY8ZX2XrmHawt99/u1y6RgrZMTeoPfpUbV96HOalYgz1qzkRbw54Pmg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=18.0.0"
+      }
+    },
     "node_modules/hoist-non-react-statics": {
       "version": "3.3.2",
       "resolved": "https://registry.npmjs.org/hoist-non-react-statics/-/hoist-non-react-statics-3.3.2.tgz",
diff --git a/package.json b/package.json
index 0d8dcd7..784e0e6 100755
--- a/package.json
+++ b/package.json
@@ -25,6 +25,7 @@
     "express-rate-limit": "^8.3.0",
     "express-session": "^1.18.1",
     "geoip-lite": "^1.4.10",
+    "helmet": "^8.1.0",
     "iconv-lite": "^0.7.2",
     "jsdom": "^28.1.0",
     "mariadb": "^3.5.2",
diff --git a/routes/auth.js b/routes/auth.js
index 87f5866..1e1f302 100644
--- a/routes/auth.js
+++ b/routes/auth.js
@@ -1,12 +1,22 @@
 const express = require('express');
 const bcrypt = require('bcrypt');
 const path = require('path');
+const rateLimit = require('express-rate-limit');
 const db = require('../lib/db');
 const log = require('../lib/logger');
 
 const router = express.Router();
 const SALT_ROUNDS = 10;
 
+// Rate limiting for auth endpoints
+const authLimiter = rateLimit({
+  windowMs: 15 * 60 * 1000, // 15 min
+  max: 10,                   // 10 attempts per window
+  message: { error: 'Слишком много попыток. Попробуйте через 15 минут.' },
+  standardHeaders: true,
+  legacyHeaders: false,
+});
+
 // Pages
 router.get('/login', (req, res) => {
   if (req.session.user) return res.redirect('/dashboard');
@@ -19,7 +29,7 @@ router.get('/register', (req, res) => {
 });
 
 // Login API
-router.post('/login', express.json(), express.urlencoded({ extended: true }), async (req, res) => {
+router.post('/login', authLimiter, express.json(), express.urlencoded({ extended: true }), async (req, res) => {
   const { email, password } = req.body;
 
   if (!email || !password) {
@@ -32,6 +42,10 @@ router.post('/login', express.json(), express.urlencoded({ extended: true }), as
       return res.status(401).json({ error: 'Неверный email или пароль' });
     }
 
+    if (user.is_blocked) {
+      return res.status(403).json({ error: 'Аккаунт заблокирован' });
+    }
+
     const valid = await bcrypt.compare(password, user.password_hash);
     if (!valid) {
       return res.status(401).json({ error: 'Неверный email или пароль' });
@@ -39,25 +53,40 @@ router.post('/login', express.json(), express.urlencoded({ extended: true }), as
 
     await db.updateLastLogin(user.id);
 
-    req.session.user = {
-      id: user.id,
-      email: user.email,
-      name: user.display_name || user.email.split('@')[0],
-      role: user.role || 'user',
-    };
+    // Session regeneration (prevent session fixation)
+    const returnTo = req.session.returnTo;
+    req.session.regenerate((err) => {
+      if (err) {
+        log.error('Session regenerate error', { error: err.message });
+        return res.status(500).json({ error: 'Ошибка сервера' });
+      }
 
-    log.info(`Login: ${user.email}`);
-    res.json({ ok: true, redirect: req.session.returnTo || '/dashboard' });
-    delete req.session.returnTo;
+      req.session.user = {
+        id: user.id,
+        email: user.email,
+        name: user.display_name || user.email.split('@')[0],
+        role: user.role || 'user',
+      };
+
+      log.info(`Login: ${user.email}`);
+      res.json({ ok: true, redirect: returnTo || '/dashboard' });
+    });
   } catch (err) {
     log.error('Login error', { error: err.message });
     res.status(500).json({ error: 'Ошибка сервера' });
   }
 });
 
+// Sanitize display name (strip HTML tags)
+function sanitizeName(name) {
+  if (!name) return '';
+  return name.replace(/<[^>]*>/g, '').trim().slice(0, 100);
+}
+
 // Register API
-router.post('/register', express.json(), express.urlencoded({ extended: true }), async (req, res) => {
-  const { email, password, password2, name } = req.body;
+router.post('/register', authLimiter, express.json(), express.urlencoded({ extended: true }), async (req, res) => {
+  const { email, password, password2 } = req.body;
+  const name = sanitizeName(req.body.name);
 
   if (!email || !password) {
     return res.status(400).json({ error: 'Email и пароль обязательны' });
diff --git a/routes/parser.js b/routes/parser.js
index 125910f..73d8b49 100644
--- a/routes/parser.js
+++ b/routes/parser.js
@@ -6,8 +6,13 @@ const geoip = require('geoip-lite');
 const log = require('../lib/logger');
 const { validateUrl } = require('../lib/ssrf');
 
+const rateLimit = require('express-rate-limit');
+
 const router = express.Router();
 
+// Rate limit parser endpoints (prevent DDoS via server)
+const parserLimiter = rateLimit({ windowMs: 60000, max: 20, message: { error: 'Слишком много запросов' } });
+
 // In-memory cache (max 50 entries, 10 min TTL)
 const cache = new Map();
 const CACHE_TTL = 10 * 60 * 1000;
@@ -165,7 +170,7 @@ async function fetchAndParse(url) {
 }
 
 // Full parse
-router.get('/parse', async (req, res) => {
+router.get('/parse', parserLimiter, async (req, res) => {
   const check = await validateUrl(req.query.url);
   if (!check.safe) return res.status(400).json({ error: check.error });
   try {
@@ -181,7 +186,7 @@ router.get('/parse', async (req, res) => {
 });
 
 // Metadata only
-router.get('/metadata', async (req, res) => {
+router.get('/metadata', parserLimiter, async (req, res) => {
   const check = await validateUrl(req.query.url);
   if (!check.safe) return res.status(400).json({ error: check.error });
   try {
@@ -197,7 +202,7 @@ router.get('/metadata', async (req, res) => {
 });
 
 // Text only
-router.get('/text', async (req, res) => {
+router.get('/text', parserLimiter, async (req, res) => {
   const check = await validateUrl(req.query.url);
   if (!check.safe) return res.status(400).json({ error: check.error });
   try {
@@ -209,7 +214,7 @@ router.get('/text', async (req, res) => {
 });
 
 // Preview card
-router.get('/preview', async (req, res) => {
+router.get('/preview', parserLimiter, async (req, res) => {
   const check = await validateUrl(req.query.url);
   if (!check.safe) return res.status(400).json({ error: check.error });
   try {
diff --git a/server.js b/server.js
index afa7f2a..7e10333 100755
--- a/server.js
+++ b/server.js
@@ -8,12 +8,24 @@ const authMiddleware = require('./lib/auth');
 const app = express();
 app.set('trust proxy', 1);
 
+// Security headers
+const helmet = require('helmet');
+app.use(helmet({
+  contentSecurityPolicy: false, // Tailwind CDN needs inline scripts
+  crossOriginEmbedderPolicy: false,
+}));
+
 // Session
 app.use(session({
   secret: process.env.SESSION_SECRET || 'change-me-in-env',
   resave: false,
   saveUninitialized: false,
-  cookie: { maxAge: 30 * 24 * 60 * 60 * 1000 },
+  cookie: {
+    maxAge: 24 * 60 * 60 * 1000, // 1 day
+    httpOnly: true,
+    secure: process.env.NODE_ENV === 'production',
+    sameSite: 'lax',
+  },
 }));
 
 // Static assets (before auth — always public)