CVE-2016-4911

MEDIUMNVD 4.34.3—

4.3

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 v3: 4.3
EG Score: 4.3(medium)
EPSS: 53.8%
KEV: Not listed

Published

June 13, 2016

Last Modified

May 6, 2026

References (12)

cve@mitrehttp://www.openwall.com/lists/oss-security/2016/05/17/10
cve@mitrehttp://www.openwall.com/lists/oss-security/2016/05/17/11
cve@mitrehttp://www.securityfocus.com/bid/90728
cve@mitrehttps://bugs.launchpad.net/keystone/+bug/1577558
cve@mitrehttps://review.openstack.org/#/c/311886/
cve@mitrehttps://security.openstack.org/ossa/OSSA-2016-008.html
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2016/05/17/10
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2016/05/17/11
af854a3a-2127-422b-91ae-364da2661108http://www.securityfocus.com/bid/90728
af854a3a-2127-422b-91ae-364da2661108https://bugs.launchpad.net/keystone/+bug/1577558
af854a3a-2127-422b-91ae-364da2661108https://review.openstack.org/#/c/311886/
af854a3a-2127-422b-91ae-364da2661108https://security.openstack.org/ossa/OSSA-2016-008.html

Affected Packages

(1 across 1 ecosystem)

PyPI(1)

Package	Vulnerable range	Fixed in	Dependents
keystone	—	9.0.1	—

Data Freshness Timeline

(refreshed 11× in last 7d / 19× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 13:38 UTCepss_batch
2026-05-27 13:38 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:16 UTCepss_batch
2026-05-24 16:43 UTCepss_batch
2026-05-23 00:10 UTCEG score recompute
2026-05-22 21:15 UTCepss_batch
2026-05-22 21:15 UTCepss_batch
2026-05-22 20:00 UTCEG score recompute
2026-05-22 14:43 UTCOSV refresh
2026-05-21 22:40 UTCepss_batch
2026-05-20 22:37 UTCepss_batch
2026-05-20 22:37 UTCepss_batch
2026-05-20 22:37 UTCepss_batch
2026-05-20 11:21 UTCepss_batch
2026-05-20 11:21 UTCepss_batch
2026-05-20 11:21 UTCepss_batch
2026-05-18 21:30 UTCepss_batch
2026-05-18 21:30 UTCepss_batch

Frequently asked(5)

What is CVE-2016-4911?

CVE-2016-4911 is a medium vulnerability published on June 13, 2016. 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.

When was CVE-2016-4911 disclosed?

CVE-2016-4911 was first published in the National Vulnerability Database on June 13, 2016, with the most recent update on May 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2016-4911 actively exploited?

CVE-2016-4911 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 53.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2016-4911?

CVE-2016-4911 has a CVSS v3 base score of 4.3 (NVD).

How do I remediate CVE-2016-4911?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-4911, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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CVE-2016-4911

📅 Published

🔄 Last Modified

🔗 References (12)