For many years, XenForo has used reCAPTCHA as its default CAPTCHA provider to help mitigate spam and bot actions without requiring our customers to go through additional configuration. However, we have recently been informed that restrictions may be placed on the reCAPTCHA key included in XenForo. This may lead to CAPTCHAs not being enforced or failing to validate.
If you have not changed the default CAPTCHA method, to avoid disruption, we urge customers to take one of the actions below to resolve this issue.
Best solution:
Upgrade to XenForo 2.2.5
Alongside this announcement, we have released XenForo 2.2.5 which changes the default CAPTCHA provider to hCaptcha. hCaptcha is used by many companies, including by CloudFlare all across...