Description
WordPress Plugin WP Maintenance is prone to a cross-site request forgery vulnerability. Exploiting this issue may allow a remote attacker to perform certain administrative actions and gain unauthorized access to the affected application; other attacks are also possible. WordPress Plugin WP Maintenance version 5.0.5 is vulnerable; prior versions may also be affected.
Remediation
Update to plugin version 5.0.7 or latest
References
https://www.wordfence.com/blog/2019/11/high-severity-vulnerability-patched-in-wp-maintenance-plugin/
https://plugins.svn.wordpress.org/wp-maintenance/trunk/readme.txt