Description
WordPress Plugin The Events Calendar is prone to a security bypass vulnerability. Exploiting this issue may allow attackers to perform otherwise restricted actions and subsequently gain root access through an backdoored javascript. WordPress Plugin The Events Calendar version 3.11.2 is vulnerable; prior versions are also affected.
Remediation
Update to plugin version 3.12 or latest
References
https://zyan.scripts.mit.edu/blog/backdooring-js/
https://github.com/gruntjs/grunt-contrib-uglify/issues/350
https://wordpress.org/plugins/the-events-calendar/changelog/