Gitblit 1.9.2 allows privilege escalation via the Config User Service: a control character can be placed in a profile data field, such as an emailAddress%3Atext '[email protected]\n\trole = "#admin"' value.
https://github.com/advisories/GHSA-fh55-vwjc-69c7
https://github.com/gitblit/gitblit/releases/tag/v1.9.3