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Upgrading from 3.0.10
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Due to a security hole that could allow bots to by-pass textcaptcha's, it was necessary to re-engineer the gem for the v4.0.0 release.
Thanks to Jeffrey Lim for spotting this and raising the issue.
Upgrading is straightforward;
Any strong parameter calls should include the
params.require(:comment).permit(:textcaptcha_answer, :textcaptcha_key, ... )