Less than a month after 2.6.1 was released, WordPress have publicly released 2.6.2 for download. This release is recommended in particular to those who allow users to register on their blog.
According to WordPress :
If you allow open registration on your blog, you should definitely upgrade. With open registration enabled, it is possible in WordPress versions 2.6.1 and earlier to craft a username such that it will allow resetting another user’s password to a randomly generated password. The randomly generated password is not disclosed to the attacker, so this problem by itself is annoying but not a security exploit. However, this attack coupled with a weakness in the random number seeding in mt_rand() could be used to predict the randomly generated password. Stefan Esser will release details of the complete attack shortly. The attack is difficult to accomplish, but its mere possibility means we recommend upgrading to 2.6.2.
I suspect that future releases of 2.6x will be small security updates like this one as WP Beta is currently at 2.7 and some people have even been trying it out on live sites. However, as with every major release, I would advise you all to update as it’s quick and easy to upload the files and it will tighten up the security of your blog.
Link : Download WordPress 2.6.2