Description
A flaw was found in OpenStack Keystone. This vulnerability allows remote authenticated users to bypass intended authorization restrictions. This occurs because OpenStack Keystone does not properly handle EC2 (Elastic Compute Cloud) tokens when a user's role has been removed from a tenant. An attacker can leverage a token associated with a removed user role to gain unauthorized access.
Published: 2012-12-18
Score: 5.4 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

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Tracking

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Advisories
Source ID Title
EUVD EUVD EUVD-2012-0016 OpenStack Keystone Essex (2012.1) and Folsom (2012.2) does not properly handle EC2 tokens when the user role has been removed from a tenant, which allows remote authenticated users to bypass intended authorization restrictions by leveraging a token for the removed user role.
Github GHSA Github GHSA GHSA-qvpr-qm6w-6rcc OpenStack Keystone intended authorization restrictions bypass
Ubuntu USN Ubuntu USN USN-1641-1 OpenStack Keystone vulnerabilities
History

Tue, 07 Apr 2026 07:15:00 +0000

Type Values Removed Values Added
Description OpenStack Keystone Essex (2012.1) and Folsom (2012.2) does not properly handle EC2 tokens when the user role has been removed from a tenant, which allows remote authenticated users to bypass intended authorization restrictions by leveraging a token for the removed user role. A flaw was found in OpenStack Keystone. This vulnerability allows remote authenticated users to bypass intended authorization restrictions. This occurs because OpenStack Keystone does not properly handle EC2 (Elastic Compute Cloud) tokens when a user's role has been removed from a tenant. An attacker can leverage a token associated with a removed user role to gain unauthorized access.
Title OpenStack: Keystone EC2-style credentials invalidation issue Openstack keystone: openstack keystone: authorization bypass via improper ec2 token handling
Weaknesses CWE-639
CPEs cpe:/a:redhat:openstack:13
cpe:/a:redhat:openstack:16.2
cpe:/a:redhat:openstack:17.1
cpe:/a:redhat:openstack:18.0
References
Metrics cvssV3_1

{'score': 5.4, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-04-07T06:55:17.789Z

Reserved: 2012-10-24T00:00:00.000Z

Link: CVE-2012-5571

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2012-12-18T01:55:03.570

Modified: 2026-04-07T07:16:22.450

Link: CVE-2012-5571

cve-icon Redhat

Severity : Moderate

Publid Date: 2012-11-28T00:00:00Z

Links: CVE-2012-5571 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses