An issue has been discovered in Magento Open Source and Magento Commerce that can be used to disclose the URL location of a Magento Admin panel.
While there is currently no reason to believe this issue would lead to a compromise directly, knowing the URL location could make it easier to automate attacks.
To help prevent against potential attacks, Magento has released patches for this issue.
For complete details, install instructions, and recommendations, see:
https://magento.com/security/security-update-potential-vulnerability-magento-admin-url-location