{"id":"UBUNTU-CVE-2016-4911","details":"The Fernet Token Provider in OpenStack Identity (Keystone) 9.0.x before 9.0.1 (mitaka) allows remote authenticated users to prevent revocation of a chain of tokens and bypass intended access restrictions by rescoping a token.","modified":"2025-07-16T08:12:17.920304Z","published":"2016-06-13T14:59:00Z","withdrawn":"2025-07-18T16:43:31Z","upstream":["CVE-2016-4911"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2016-4911"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2016-4911"}],"affected":[{"package":{"name":"keystone","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/keystone@2:9.3.0-0ubuntu3?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:9.3.0-0ubuntu3"}]}],"versions":["2:8.0.0-0ubuntu1","2:9.0.0~b1-0ubuntu1","2:9.0.0~b2-0ubuntu1","2:9.0.0~b3-0ubuntu1","2:9.0.0~rc1-0ubuntu1","2:9.0.0-0ubuntu1","2:9.0.2-0ubuntu1","2:9.0.2-0ubuntu2","2:9.1.0-0ubuntu1","2:9.2.0-0ubuntu1","2:9.3.0-0ubuntu1","2:9.3.0-0ubuntu2"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"keystone","binary_version":"2:9.3.0-0ubuntu3"},{"binary_name":"keystone-doc","binary_version":"2:9.3.0-0ubuntu3"},{"binary_name":"python-keystone","binary_version":"2:9.3.0-0ubuntu3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2016/UBUNTU-CVE-2016-4911.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"},{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"},{"type":"Ubuntu","score":"medium"}]}