CVE-2026-42999

Severity CVSS v4.0:

Pending analysis

Type:

Unavailable / Other

Publication date:

28/05/2026

Last modified:

30/06/2026

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).

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L CVSS v3.1 Severity and Metrics:

Base Score: 6.00 MEDIUM
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L

Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Changed
Confidentiality (C): Low
Integrity (I): Low
Availability (A): Low

Base Score 3.x

6.00

Severity 3.x

MEDIUM

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:openstack:keystone::::::::	14.0.0 (including)	27.0.2 (excluding)
cpe:2.3:a:openstack:keystone::::::::	28.0.0 (including)	28.0.2 (excluding)
cpe:2.3:a:openstack:keystone::::::::	29.0.0 (including)	29.0.2 (excluding)

To consult the complete list of CPE names with products and versions, see this page

CVE-2026-42999

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools