Some Reddit users discovered they were locked out of their own accounts earlier this week after an apparent credential stuffing attack compelled the popular website to invoke password security measures.

An admin post published on Reddit’s Help subreddit this past Wednesday advises users that a "large group of accounts were locked down" due to anomalous activity suggesting unauthorized access. Consequently, affected users were informed they would have to rest their passwords to regain access.

In a credential stuffing attack, malicious actors attempt to use passwords previously stolen from one source to illegally access other, unrelated websites and online services, in hopes that the user entered the same credentials.

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