Jenkins Reverse Proxy Auth Plugin allows attackers with local file system access to obtain a list of authorities for logged in users

An exposure of sensitive information vulnerability exists in Jenkins Reverse Proxy Auth Plugin 1.5 and older in ReverseProxySecurityRealm#authContext that allows attackers with local file system access to obtain a list of authorities for logged in users. Reverse Proxy Auth Plugin 1.6.0 and newer no longer store the cache of granted authorities on disk.