Backdoor in Captcha Plugin Affects 300K WordPress Sites

Wordfence has reported a backdoor in a Captcha plugin called “Captcha free plugin” that was recently removed from the WordPress.org repository.

Author site here : https://bestwebsoft.com/free-captcha-version-is-now-supported-by-other-developers/

Backdoor report here:  https://www.wordfence.com/blog/2017/12/backdoor-captcha-plugin/