Description
WordPress Plugin Mailster-Email Newsletter for WordPress is prone to a local file inclusion vulnerability because it fails to sufficiently verify user-supplied input. Exploiting this issue may allow an attacker to obtain sensitive information that could aid in further attacks. WordPress Plugin Mailster-Email Newsletter for WordPress version 4.0.6 is vulnerable; prior versions may also be affected.
Remediation
Update to plugin version 4.0.7 or latest