The first half of November was a busy one for Security. Ithemes has reported that there were many vuneranilities reported in the first half of the month. This list is very comprehensive and can be found by reading here: https://ithemes.com/wordpress-vulnerability-roundup-november-2019-part-1/
Wordfence also reported a High vunerability in the WordPress Mainteance Plugin this past week. Details can be found by clicking here: https://www.wordfence.com/blog/2019/11/high-severity-vulnerability-patched-in-wp-maintenance-plugin/
Keep your website safe by doing regular updates. Always backup first before updating your WordPress site.