The Internet Archive failed to rotate API keys, which meant attackers still had some level of access.
https://www.techradar.com/pro/the-internet-archive-hit-with-a-new-level-of-cyberattack
The Internet Archive hit with a new level of cyberattack
Just another WordPress site
https://www.techradar.com/pro/the-internet-archive-hit-with-a-new-level-of-cyberattack