Great plugin, but unfortunately it had a backdoor for an attacker accordingly to the link https://www.wordfence.com/blog/2017/12/backdoor-captcha-plugin/. For this reason, the plugin was marked as âThis plugin has been closed for new installsâ. The cited site says that the backdoor is present in all versions bellow of 4.4.5 version. Anyway, the cited site recommends the uninstalling of this plugin
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