diff --git a/openerp/addons/base/ir/ir_attachment.py b/openerp/addons/base/ir/ir_attachment.py
index 19c66635938..996b0f69c4b 100644
--- a/openerp/addons/base/ir/ir_attachment.py
+++ b/openerp/addons/base/ir/ir_attachment.py
@@ -28,6 +28,8 @@ import re
 from openerp import tools
 from openerp.osv import fields,osv
 from openerp import SUPERUSER_ID
+from openerp.osv.orm import except_orm
+from openerp.tools.translate import _
 
 _logger = logging.getLogger(__name__)
 
@@ -189,12 +191,14 @@ class ir_attachment(osv.osv):
         more complex ones apply there.
         """
         res_ids = {}
+        require_employee = False
         if ids:
             if isinstance(ids, (int, long)):
                 ids = [ids]
             cr.execute('SELECT DISTINCT res_model, res_id FROM ir_attachment WHERE id = ANY (%s)', (ids,))
             for rmod, rid in cr.fetchall():
                 if not (rmod and rid):
+                    require_employee = True
                     continue
                 res_ids.setdefault(rmod,set()).add(rid)
         if values:
@@ -206,10 +210,16 @@ class ir_attachment(osv.osv):
             # ignore attachments that are not attached to a resource anymore when checking access rights
             # (resource was deleted but attachment was not)
             if not self.pool.get(model):
+                require_employee = True
                 continue
-            mids = self.pool.get(model).exists(cr, uid, mids)
+            existing_ids = self.pool.get(model).exists(cr, uid, mids)
+            if len(existing_ids) != len(mids):
+                require_employee = True
             ima.check(cr, uid, model, mode)
-            self.pool.get(model).check_access_rule(cr, uid, mids, mode, context=context)
+            self.pool.get(model).check_access_rule(cr, uid, existing_ids, mode, context=context)
+        if require_employee:
+            if not self.pool['res.users'].has_group(cr, uid, 'base.group_user'):
+                raise except_orm(_('Access Denied'), _("Sorry, you are not allowed to access this document."))
 
     def _search(self, cr, uid, args, offset=0, limit=None, order=None, context=None, count=False, access_rights_uid=None):
         ids = super(ir_attachment, self)._search(cr, uid, args, offset=offset,