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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/