diff --git a/app.py b/app.py
index 4f02958..4c0e494 100644
--- a/app.py
+++ b/app.py
@@ -7780,6 +7780,7 @@ def release_notes():
 # ============================================================
 
 @app.route('/zopk')
+@limiter.limit("60 per minute")  # SECURITY: Rate limit public ZOPK page
 def zopk_index():
     """
     Public knowledge base page for ZOPK.
@@ -7830,6 +7831,7 @@ def zopk_index():
 
 
 @app.route('/zopk/projekty/<slug>')
+@limiter.limit("60 per minute")  # SECURITY: Rate limit public ZOPK project pages
 def zopk_project_detail(slug):
     """Project detail page"""
     from database import ZOPKProject, ZOPKNews, ZOPKResource, ZOPKCompanyLink
@@ -7869,6 +7871,7 @@ def zopk_project_detail(slug):
 
 
 @app.route('/zopk/aktualnosci')
+@limiter.limit("60 per minute")  # SECURITY: Rate limit public ZOPK news list
 def zopk_news_list():
     """All ZOPK news - paginated"""
     from database import ZOPKProject, ZOPKNews
@@ -8153,7 +8156,7 @@ def admin_zopk_news_add():
     if not current_user.is_admin:
         return jsonify({'success': False, 'error': 'Brak uprawnień'}), 403
 
-    from database import ZOPKNews
+    from database import ZOPKNews, ZOPKProject
     import hashlib
 
     db = SessionLocal()
@@ -8169,6 +8172,25 @@ def admin_zopk_news_add():
         if not title or not url:
             return jsonify({'success': False, 'error': 'Tytuł i URL są wymagane'}), 400
 
+        # SECURITY: Validate URL protocol (block javascript:, data:, etc.)
+        from urllib.parse import urlparse
+        parsed = urlparse(url)
+        allowed_protocols = ('http', 'https')
+        if parsed.scheme.lower() not in allowed_protocols:
+            return jsonify({'success': False, 'error': 'Nieprawidłowy protokół URL. Dozwolone: http, https'}), 400
+
+        # SECURITY: Validate project_id if provided
+        if project_id:
+            try:
+                project_id = int(project_id)
+                project = db.query(ZOPKProject).filter(ZOPKProject.id == project_id).first()
+                if not project:
+                    return jsonify({'success': False, 'error': 'Nieprawidłowy ID projektu'}), 400
+            except (ValueError, TypeError):
+                return jsonify({'success': False, 'error': 'ID projektu musi być liczbą'}), 400
+        else:
+            project_id = None
+
         # Generate URL hash for deduplication
         url_hash = hashlib.sha256(url.encode()).hexdigest()
 
@@ -8178,8 +8200,6 @@ def admin_zopk_news_add():
             return jsonify({'success': False, 'error': 'Ten artykuł już istnieje w bazie'}), 400
 
         # Extract domain from URL
-        from urllib.parse import urlparse
-        parsed = urlparse(url)
         source_domain = parsed.netloc.replace('www.', '')
 
         news = ZOPKNews(
@@ -8194,7 +8214,7 @@ def admin_zopk_news_add():
             moderated_by=current_user.id,
             moderated_at=datetime.now(),
             published_at=datetime.now(),
-            project_id=project_id if project_id else None
+            project_id=project_id
         )
         db.add(news)
         db.commit()
@@ -8207,7 +8227,8 @@ def admin_zopk_news_add():
 
     except Exception as e:
         db.rollback()
-        return jsonify({'success': False, 'error': str(e)}), 500
+        logger.error(f"Error adding ZOPK news: {e}")
+        return jsonify({'success': False, 'error': 'Wystąpił błąd podczas dodawania newsa'}), 500
 
     finally:
         db.close()
diff --git a/templates/admin/zopk_news.html b/templates/admin/zopk_news.html
index 876cbca..3d177cd 100644
--- a/templates/admin/zopk_news.html
+++ b/templates/admin/zopk_news.html
@@ -443,7 +443,7 @@ function showConfirm(message, options = {}) {
         const modal = document.getElementById('confirmModal');
         document.getElementById('confirmModalIcon').textContent = options.icon || '❓';
         document.getElementById('confirmModalTitle').textContent = options.title || 'Potwierdzenie';
-        document.getElementById('confirmModalMessage').innerHTML = message;
+        document.getElementById('confirmModalMessage').textContent = message;
         document.getElementById('confirmModalCancel').textContent = options.cancelText || 'Anuluj';
         document.getElementById('confirmModalOk').textContent = options.okText || 'OK';
         document.getElementById('confirmModalOk').className = 'btn ' + (options.okClass || 'btn-primary');
@@ -479,7 +479,14 @@ function showToast(message, type = 'info', duration = 4000) {
     const icons = { success: '✓', error: '✕', warning: '⚠', info: 'ℹ' };
     const toast = document.createElement('div');
     toast.className = `toast ${type}`;
-    toast.innerHTML = `<span style="font-size: 1.2em;">${icons[type] || icons.info}</span><span>${message}</span>`;
+    // Bezpieczne tworzenie elementów - unikamy innerHTML z danymi użytkownika
+    const iconSpan = document.createElement('span');
+    iconSpan.style.fontSize = '1.2em';
+    iconSpan.textContent = icons[type] || icons.info;
+    const msgSpan = document.createElement('span');
+    msgSpan.textContent = message;
+    toast.appendChild(iconSpan);
+    toast.appendChild(msgSpan);
     container.appendChild(toast);
     setTimeout(() => { toast.style.animation = 'slideOut 0.3s ease forwards'; setTimeout(() => toast.remove(), 300); }, duration);
 }