I’d change your e-mail password too, just in case.
One of the biggest mistakes I see people do is logging in and then not logging out. Especially bad when using a public computer (like at the library or uni), or on an unsecured network and not using the https option for the Dashboard. http://en.support.wordpress.com/security/
More suggestions here:
Thanks for letting us know about this. We also noticed spam posts appearing on some sites. We have reset the passwords of all affected users and have sent them an email to let them know. If there was any spam posted and not removed before we got there, we also went ahead and cleaned that up.
It is very likely that you were using the same password on WordPress.com that you used elsewhere. Recently, a few large services — LinkedIn, Yahoo, eHarmony, and Last.fm to name a few — have suffered well-publicized security breaches that have exposed email addresses and passwords. Although the passwords are usually stored securely, simple passwords can be decrypted or “cracked” in a matter of hours using modern technology.
Hackers gather the lists of email addresses and passwords from these services and then try to use them to access accounts on other popular services, like WordPress.com. If you used the same password multiple places, then your account can be compromised. That is what happened here. We do have measures in place to protect password guessing or “brute force” attacks but in this case, since the password is known beforehand, there is no need for a hacker to guess.
You should have a strong, unique password for every account you have on the internet. We have some more information on selecting a strong password in our Support section, please read through it:
If you have any additional questions about the security of your account, please contact us using the form on this page:
We take security seriously, and are happy to answer any questions you have.
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