Description
Jenkins Mattermost Notification Plugin 2.7.0 and earlier stored webhook URLs containing a secret token unencrypted in its global configuration file and 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.
Remediation
References
http://www.openwall.com/lists/oss-security/2019/10/23/2
https://jenkins.io/security/advisory/2019-10-23/#SECURITY-1628