A flaw was found in the modproxycluster in the Apache server. A malicious user can add a script in the 'alias' parameter in the URL to trigger the stored cross-site scripting vulnerability. by adding a script on the alias parameter on the URL it adds a new virtual host and adds the script to the cluster-manager page. The impact of this vulnerability is considered as Low as the clustermanager URL should NOT be exposed outside and protected by user/password.