You can clone with
Line 285 - system/core/Security.php - $str = $this->_validate_entities($str);
Append a ";" to the end of the string, given string "$98dubrucHa7a&EC" becomes "$98dubrucHa7a&EC;", was checking the password it was not matching. The cause most be the &EC as it's not a valid entity but should be able to have invalid entities in a string.
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@narfbg I see you closed this issue, but I am using the latest development branch and I am experiencing the same issue.
string(7) "@2$&7834;" // filtered
string(6) "@2$&7834" // un-filtered
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@crypticmauler I closed it by referencing another, as a duplicate.
This is still affecting CI3.0. Has it been fixed? At least if its not going to be fixed. It needs to be in the documentation.