{"id":"CVE-2016-4911","aliases":["GHSA-f82m-w3p3-cgp3","PYSEC-2016-38"],"url":"https://o3.security/vulnerability/CVE-2016-4911","summary":"OpenStack Identity Keystone Improper Access Control ","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.","published":"2016-06-13T14:59:07.323Z","modified":"2026-03-15T22:08:15.381761Z","cvss":{"score":4.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"keystone","fixedVersion":"9.0.1"}],"fix":null,"references":[{"type":"ADVISORY","url":"http://www.securityfocus.com/bid/90728"},{"type":"ADVISORY","url":"https://bugs.launchpad.net/keystone/+bug/1577558"},{"type":"ADVISORY","url":"https://review.openstack.org/#/c/311886/"},{"type":"FIX","url":"https://security.openstack.org/ossa/OSSA-2016-008.html"},{"type":"ARTICLE","url":"http://www.openwall.com/lists/oss-security/2016/05/17/10"},{"type":"ARTICLE","url":"http://www.openwall.com/lists/oss-security/2016/05/17/11"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-03-15T22:08:15.381761Z"}}