{"cve":"CVE-2016-4911","nvd":{"published":"2016-06-13T14:59:07.323","modified":"2026-06-17T00:48:26.320","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","score":4.3},"cwes":["CWE-284"],"references":["http://www.openwall.com/lists/oss-security/2016/05/17/10","http://www.openwall.com/lists/oss-security/2016/05/17/11","http://www.securityfocus.com/bid/90728","https://bugs.launchpad.net/keystone/+bug/1577558","https://review.openstack.org/#/c/311886/"],"products":["keystone:openstack_identity"],"source":"nvd","synced_at":"2026-10-19T20:38:51.654415212+00:00"},"epss":{"cve":"CVE-2016-4911","score":0.01402,"percentile":0.72533,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-f82m-w3p3-cgp3","url":"https://osv.dev/vulnerability/GHSA-f82m-w3p3-cgp3","summary":"OpenStack Identity Keystone Improper Access Control ","modified":"2024-11-26T18:27:07Z","packages":[{"ecosystem":"PyPI","name":"keystone","purl":"pkg:pypi/keystone","ranges":[">=9.0.0 <9.0.1"],"fixed":["9.0.1"]}]},{"id":"PYSEC-2016-38","url":"https://osv.dev/vulnerability/PYSEC-2016-38","summary":"","modified":"2024-11-25T22:42:22.796252Z","packages":[{"ecosystem":"PyPI","name":"keystone","purl":"pkg:pypi/keystone","ranges":[">=9.0.0 <9.0.1"],"fixed":["9.0.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}