An issue was discovered in OpenStack Keystone before 29.0.2. The Keystone RBAC policy enforcer in enforce_call unconditionally merges the raw JSON request body into the policy enforcement dictionary via policy_dict.update(json_input.copy()), overwriting trusted target data that was previously set from database lookups. Because flask.request.get_json is called with force=True, this works regardless of Content-Type or HTTP method. Any authenticated user can inject arbitrary policy target attributes (e.g., user_id, project_id) into the request body to bypass RBAC checks and perform unauthorized operations on resources belonging to other users or projects. This was introduced in commit 5ea59f52 (Rocky/14.0.0).

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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, 28 May 2026 22:00:00 +0000

Type Values Removed Values Added
Title Keystone RBAC Bypass via Untrusted JSON Input

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 RBAC policy enforcer in enforce_call unconditionally merges the raw JSON request body into the policy enforcement dictionary via policy_dict.update(json_input.copy()), overwriting trusted target data that was previously set from database lookups. Because flask.request.get_json is called with force=True, this works regardless of Content-Type or HTTP method. Any authenticated user can inject arbitrary policy target attributes (e.g., user_id, project_id) into the request body to bypass RBAC checks and perform unauthorized operations on resources belonging to other users or projects. This was introduced in commit 5ea59f52 (Rocky/14.0.0).
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

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-05-28T19:42:27.483Z

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

Link: CVE-2026-42999

cve-icon Vulnrichment

Updated: 2026-05-28T19:42:22.178Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-05-28T19:16:37.630

Modified: 2026-05-29T15:42:56.873

Link: CVE-2026-42999

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-28T21:45:27Z

Weaknesses