There is a global attack on WordPress websites being carried out by a Global Botnet Attack which is said to be made up of at least 100,000 hacked computers.
This large worldwide attack on WordPress websites is effecting hosting companies across the globe forcing them to make changes and add an extra layer of security.
The attack is a brute force attack of the admin area to try and gain access to the WordPress websites.
There are early indications that the hackers are using the access they can achieve to install malicious scripts onto the hosting servers and then use these to attack other websites.
This is having a huge issue on shared hosting servers as the impact of a DDoS (distributed denial-of-service) attack will take down the shared hosting server.
Because the hosting servers have large network connections and are capable of generating significant amounts of traffic the problem is much larger than peoples computer being used to carry out a DDos attack.