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PHP session is shared with different users
$auth = Zend_Auth::getInstance();
        $authAdapter = new Altergear_Seolista_UserLoginAuthAdapter(
            $loginForm->getLogin(),
            $loginForm->getPassword()
        );

        $result = $auth->authenticate($authAdapter);

<?php

/**
 * The user password
 * @var string $_password
 */
private $_password;

/**
 * The Doctrine EntityManager
 * @var EntityManager $_em
 */
private $_em;
public function __construct( $email, $password )
{
    $registry = Zend_Registry::getInstance();
    $this->_em = $registry->entitymanager;

    $this->_login = $email;
    $this->_password = $password;
}

/**
 * Executes an authentication try
 *
 * @throws Zend_Auth_Adapter_Exception if the authentication failed
 * @return Zend_Auth_Result
 */
public function authenticate()
{
        //check if login is correct
        try{
            $user = $this->_em->getRepository('App_Model_User')
                ->findOneBy(
                    array(
                        '_email' => $this->_login,
                        '_password' => App_Model_User::encodePassword( $this->_password )
                    )
            );
        }catch( Exception $e ){
            throw new Zend_Auth_Adapter_Exception( 'authentication failed', 0, $e );
        }

        if( $user!==null && $user instanceof App_Model_User && $user->getId() > 0 )
        {
            //login successful

            $identity = new stdClass();
            $identity->user = $user;


            return new Zend_Auth_Result( Zend_Auth_Result::SUCCESS , $identity );
        }else{
            //login failed
            return new Zend_Auth_Result( Zend_Auth_Result::FAILURE, NULL, array('Bitte geben Sie gültige Logindaten an.') );
        }