{"id":"CVE-2016-4911","aliases":["DEBIAN-CVE-2016-4911","EUVD-2016-0012","GHSA-f82m-w3p3-cgp3","PYSEC-2016-38","UBUNTU-CVE-2016-4911"],"status":"published","title":"OpenStack Identity Keystone Improper Access Control","description":"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.","severity":{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.01402,"percentile":0.72707,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-284"],"published":"2016-06-13T14:00:00Z","modified":"2026-09-22T07:01:23Z","fixes":[{"ecosystem":"PyPI","package":"keystone","fixed_in":["9.0.1"],"sources":["ghsa","osv"]},{"ecosystem":"Debian:12","package":"keystone","fixed_in":["2:9.0.0-2"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"keystone","fixed_in":["2:9.0.0-2"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"keystone","fixed_in":["2:9.0.0-2"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"keystone","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.0.0"},{"fixed":"9.0.1"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"keystone","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:9.0.0-2"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"keystone","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:9.0.0-2"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"keystone","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:9.0.0-2"}]}]},{"source":"osv","ecosystem":"PyPI","package":"keystone","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.0.0"},{"fixed":"9.0.1"}]}]},{"source":"osv","ecosystem":"PyPI","package":"keystone","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.0.0"},{"fixed":"9.0.1"}]}]}],"products":[{"vendor":"keystone","product":"openstack_identity"}],"references":[{"url":"https://bugs.launchpad.net/keystone/+bug/1577558","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory","advisory","web"]},{"url":"http://www.openwall.com/lists/oss-security/2016/05/17/10","tags":["mailing-list","x_refsource_MLIST","x_transferred","Mailing List","article","web"]},{"url":"http://www.securityfocus.com/bid/90728","tags":["vdb-entry","x_refsource_BID","x_transferred","Third Party Advisory","VDB Entry","advisory"]},{"url":"https://security.openstack.org/ossa/OSSA-2016-008.html","tags":["x_refsource_CONFIRM","x_transferred","Patch","Vendor Advisory","fix","web","advisory"]},{"url":"https://review.openstack.org/#/c/311886/","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory","advisory"]},{"url":"http://www.openwall.com/lists/oss-security/2016/05/17/11","tags":["mailing-list","x_refsource_MLIST","x_transferred","Mailing List","article","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2016-4911","tags":["advisory"]},{"url":"https://github.com/openstack/keystone/commit/0d376025bae61bf5ee19d992c7f336b99ac69240","tags":["web"]},{"url":"https://github.com/openstack/keystone/commit/ee1dc941042d1f71699971c5c30566af1b348572","tags":["web"]},{"url":"https://review.openstack.org/#/c/311886","tags":["web"]},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/keystone/PYSEC-2016-38.yaml","tags":["web"]},{"url":"https://github.com/advisories/GHSA-f82m-w3p3-cgp3"},{"url":"https://security-tracker.debian.org/tracker/CVE-2016-4911","tags":["advisory"]},{"url":"https://github.com/openstack/keystone","tags":["package"]},{"url":"https://ubuntu.com/security/CVE-2016-4911","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2016-4911","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2016-4911","description":"The Fernet Token Provider in OpenStack Identity (Keystone) 9.0.x before 9.0.1 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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.","status":"published","published":"2016-06-13T14:59:07.323Z","modified":"2026-09-22T07:01:23.77981738Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:45:27.627285Z"},{"id":"GHSA-f82m-w3p3-cgp3","title":"OpenStack Identity Keystone Improper Access Control ","description":"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 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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.","status":"withdrawn","published":"2016-06-13T14:59:00Z","modified":"2025-07-16T08:12:17.920304Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","level":"medium"},{"version":"3.0","score":4.3,"vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:54:12.261906Z"}]}}