Can't reset
The passwords have been revoked but it is currently impossible to reset them and create new ones, presumably due to the volume of requests.
It's kinda unimpressive when they new about the vulnerability and still failed to secure themselves against it.
Here
https://confluence.atlassian.com/hc/hipchat-server-security-advisory-2017-03-09-877346198.html
they said:
"Hipchat Cloud does not have the issue described on this page."