Jenkins Gitlab Hook Plugin 1.4.2 and earlier does not escape project names in the build_now endpoint, resulting in a reflected XSS vulnerability.

A exposure of sensitive information vulnerability exists in Jenkins Gitlab Hook Plugin 1.4.2 and older in gitlab_notifier.rb, views/gitlab_notifier/global.erb that allows attackers with local Jenkins master file system access or control of a Jenkins administrator's web browser (e.g. malicious extension) to retrieve the configured Gitlab token.