It isn't a security breach as such. It's spam. Copy the email that was used to register and search it in Google; if the first two or three hits are from the spam prevention forum it's a pretty good bet that that registration is made by a spambot.
The original idea seems to have been that comments by registered users are less likely to be caught in a spam filter; I'm not sure if that's still the case, or whether such bot registrations are now a form of spam in their own right, but there you go.
If it isn't a loss of functionality for you, the easiest way to deal with it is just to turn off open registration.
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The original idea seems to have been that comments by registered users are less likely to be caught in a spam filter; I'm not sure if that's still the case, or whether such bot registrations are now a form of spam in their own right, but there you go.
If it isn't a loss of functionality for you, the easiest way to deal with it is just to turn off open registration.
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