Jenkins Slack Notification Plugin did not perform permission checks on a method implementing form validation. This allowed users with Overall/Read access to Jenkins to connect to an attacker-specified URL using attacker-specified credentials IDs obtained through another method, capturing credentials stored in Jenkins.
Additionally, this form validation method did not require POST requests, resulting in a cross-site request forgery vulnerability.
This form validation method now requires POST requests and Overall/Administer (for global configuration) or Item/Configure permissions (for job configuration).
www.openwall.com/lists/oss-security/2019/03/28/2
github.com/jenkinsci/slack-plugin
github.com/jenkinsci/slack-plugin/commit/0268bbefdcc283effd27be5318770f7e75c6f102
jenkins.io/security/advisory/2019-03-25/#SECURITY-976
nvd.nist.gov/vuln/detail/CVE-2019-1003043
web.archive.org/web/20200227082607/www.securityfocus.com/bid/107628