A missing permission check in Jenkins Pipeline GitHub Notify Step Plugin 1.0.4 and earlier allows attackers with Overall/Read permission to connect to an attacker-specified URL using attacker-specified credentials IDs obtained through another method, capturing credentials stored in Jenkins.
https://github.com/advisories/GHSA-x7rc-5mjg-5pvr
https://jenkins.io/security/advisory/2020-02-12/#SECURITY-812%20%281%29