Jenkins Git Changelog Plugin 2.17 and earlier stored credentials unencrypted in job config.xml files on the Jenkins master where they could be viewed by users with Extended Read permission, or access to the master file system.
A cross-site scripting vulnerability exists in Jenkins Git Changelog Plugin 2.6 and earlier in GitChangelogSummaryDecorator/summary.jelly, GitChangelogLeftsideBuildDecorator/badge.jelly, GitLogJiraFilterPostPublisher/config.jelly, GitLogBasicChangelogPostPublisher/config.jelly that allows attackers able to control the Git history parsed by the plugin to have Jenkins render arbitrary HTML on some pages.