The Atlassian Hipchat Integration Plugin for Bitbucket Server 6.26.0 before 6.27.5, 6.28.0 before 7.3.7, and 7.4.0 before 7.8.17; Confluence HipChat plugin 6.26.0 before 7.8.17; and HipChat for JIRA plugin 6.26.0 before 7.8.17 allows remote attackers to obtain the secret key for communicating with HipChat instances by reading unspecified pages.
https://confluence.atlassian.com/doc/confluence-security-advisory-2016-09-21-849052104.html
http://packetstormsecurity.com/files/139004/Atlassian-HipChat-Secret-Key-Disclosure.html