An issue was discovered in OpenStack Keystone before 29.0.2. The Keystone application credential authentication plugin does not verify that the user supplied in the authentication request matches the owner of the application credential. An attacker can authenticate with their own application credential ID and secret while specifying a different user's name and domain in the request body. Keystone issues a token attributed to the victim user. The impersonated token is project-scoped and carries the intersection of the application credential's roles and the victim's actual roles on the project. This enables audit evasion, reading the victim's credentials, and acting as the victim within shared projects.

Project Subscriptions

Vendors Products
Openstack Subscribe
Keystone Subscribe
Advisories
Source ID Title
Debian DLA Debian DLA DLA-4611-1 keystone security update
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Thu, 04 Jun 2026 12:15:00 +0000

Type Values Removed Values Added
Title Impersonated Token Generation via Application Credential in OpenStack Keystone openstack-keystone: OpenStack Keystone: User impersonation and unauthorized access via insufficient application credential verification.
Weaknesses CWE-303
References
Metrics threat_severity

None

threat_severity

Moderate


Thu, 28 May 2026 20:45:00 +0000

Type Values Removed Values Added
Title Impersonated Token Generation via Application Credential in OpenStack Keystone

Thu, 28 May 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 28 May 2026 19:00:00 +0000

Type Values Removed Values Added
Description An issue was discovered in OpenStack Keystone before 29.0.2. The Keystone application credential authentication plugin does not verify that the user supplied in the authentication request matches the owner of the application credential. An attacker can authenticate with their own application credential ID and secret while specifying a different user's name and domain in the request body. Keystone issues a token attributed to the victim user. The impersonated token is project-scoped and carries the intersection of the application credential's roles and the victim's actual roles on the project. This enables audit evasion, reading the victim's credentials, and acting as the victim within shared projects.
First Time appeared Openstack
Openstack keystone
Weaknesses CWE-863
CPEs cpe:2.3:a:openstack:keystone:*:*:*:*:*:*:*:*
Vendors & Products Openstack
Openstack keystone
References
Metrics cvssV3_1

{'score': 6, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L'}


Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-05-28T19:38:42.097Z

Reserved: 2026-05-01T00:00:00.000Z

Link: CVE-2026-42998

cve-icon Vulnrichment

Updated: 2026-05-28T19:38:26.871Z

cve-icon NVD

Status : Analyzed

Published: 2026-05-28T19:16:37.483

Modified: 2026-06-02T14:50:36.337

Link: CVE-2026-42998

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-05-28T00:00:00Z

Links: CVE-2026-42998 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-06-04T14:00:15Z

Weaknesses