The official blog of jQuery—most popular JavaScript library used by millions of websites—has been hacked by some unknown hackers, using the pseudonym "str0ng" and "n3tr1x."
While there is no evidence yet if the server (code.jquery.com) that host jQuery file was also compromised, The Hacker News took a screenshot (as shown above) and can confirm that the hackers merely published a simple blog post to deface the website.
The defaced blog post URL — http://blog.jquery.com/2017/10/26/hacked/ (now removed).
Since the above-mentioned blog post was published under the name of Leah Silber, a core member of jQuery team, it seems hackers were able to make their post live by compromising Silber's account—probably by reusing her password leaked in a previous data breach.
If not, the hackers might have gained unauthorized access to the website either by exploiting a (known or zero-day) vulnerability in Wordpress script or the server.
jQuery team has immediately removed the post created by the hackers as soon as they realized there was a compromise, but so far the organisation has not released any official statement about the incident.