Yahoo on Thursday announced yet another hacking attempt, advising Yahoo Mail users to change their passwords if prompted to do so. “Security attacks are unfortunately becoming a more regular occurrence, Yahoo wrote on its official Tumblr blog. Recently, we identified a coordinated effort to gain unauthorized access to Yahoo Mail accounts. Upon discovery, we took immediate action to protect our users, prompting them to reset passwords on impacted accounts.” Users whose accounts’ passwords have not been reset are probably safe, but it may be a good measure to change passwords every once in a while anyway – you should make sure not to use weak passwords that are easy to guess, though. Yahoo did not reveal how many accounts may have