CVE-2026-42999

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).

CVSS v3 6.0 MEDIUM

6.0^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.8 / Impact : 3.7

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required LOW

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact LOW

Scope CHANGED

References

Link	Resource
https://bugs.launchpad.net/keystone/+bug/2148398	Exploit Issue Tracking Patch Third Party Advisory
https://security.openstack.org/ossa/OSSA-2026-015.html	Patch Vendor Advisory
https://access.redhat.com/security/cve/CVE-2026-42999
https://bugzilla.redhat.com/show_bug.cgi?id=2482840
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42999.json

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:openstack:keystone::::::::
	cpe:2.3:a:openstack:keystone::::::::
	cpe:2.3:a:openstack:keystone::::::::

History

No history.

Information

Published : 2026-05-28 19:16

Updated : 2026-07-23 12:18

NVD link : CVE-2026-42999

Mitre link : CVE-2026-42999

CVE.ORG link : CVE-2026-42999

JSON object : View

Products Affected

openstack

keystone

CWE

CWE-863

Incorrect Authorization

CWE-639

Authorization Bypass Through User-Controlled Key

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