SUPEE 7405: Cannot remove the item from Cart

After installing SUPEE 7405 patch on client site i notice cart issue. When you add a product to the cart and trying to remove it, you got “Cannot remove the item.” error.

The issue is connected to changes in app/code/core/Mage/Checkout/controllers/CartController.php

Before

public function deleteAction()
{
    $id = (int) $this->getRequest()->getParam('id');
    if ($id) {
        try {
            $this->_getCart()->removeItem($id)
              ->save();
        } catch (Exception $e) {
            $this->_getSession()->addError($this->__('Cannot remove the item.'));
            Mage::logException($e);
        }
    }
    $this->_redirectReferer(Mage::getUrl('*/*'));
}

After

public function deleteAction()
{
    if ($this->_validateFormKey()) {
        $id = (int)$this->getRequest()->getParam('id');
        if ($id) {
            try {
                $this->_getCart()->removeItem($id)
                    ->save();
            } catch (Exception $e) {
                $this->_getSession()->addError($this->__('Cannot remove the item.'));
                Mage::logException($e);
            }
        }
    } else {
        $this->_getSession()->addError($this->__('Cannot remove the item.'));
    }

    $this->_redirectReferer(Mage::getUrl('*/*'));
}

Patch add formkey check. To fix it you need to update
[desing_package]/[theme]/template/checkout/cart/item/default.phtml

Find

<a href="<?php echo $this->getDeleteUrl() ?>" ...

Replace with

<a href="<?php echo $this->getDeleteUrl() ?>form_key/<?php echo $formKey = Mage::getSingleton('core/session')->getFormKey();?>" ...