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).

Score

CVSS 3.1 8.8 High

Status

Modified - cve@mitre.org

Published

2026-05-28

Last modified

2026-10-26

Weaknesses

CWE-639, CWE-863

Affected products

• Keystone (Openstack)
• Openstack (Redhat)

References

• https://bugs.launchpad.net/keystone/+bug/2148398
• https://security.openstack.org/ossa/OSSA-2026-015.html
• 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