The IconUriServlet of the Atlassian OAuth Plugin from version 1.3.0 before version 1.9.12 and from version 2.0.0 before version 2.0.4 allows remote attackers to access the content of internal network resources and/or perform an XSS attack via Server Side Request Forgery (SSRF).
https://github.com/pwnosec/jira-vuln-scanner
https://github.com/Pr0t0c01/CVEs
https://github.com/imhunterand/JiraCVE
https://github.com/pwn1sher/jira-ssrf
https://github.com/random-robbie/Jira-Scan
https://twitter.com/ankit_anubhav/status/973566620676382721
https://twitter.com/Zer0Security/status/983529439433777152
https://ecosystem.atlassian.net/browse/OAUTH-344
http://dontpanic.42.nl/2017/12/there-is-proxy-in-your-atlassian.html