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).
Metrics
CVSS 3.1 8.8/10
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| OpenStack | Keystone | >= 14.0.0, < 27.0.2; >= 28.0.0, < 28.0.2; >= 29.0.0, < 29.0.2 |
| Red Hat | Red Hat OpenStack Platform 13 (Queens) | — |
| Red Hat | Red Hat OpenStack Platform 13 (Queens) | — |
| Red Hat | Red Hat OpenStack Platform 16.2 | — |
| Red Hat | Red Hat OpenStack Platform 16.2 | — |
| Red Hat | Red Hat OpenStack Platform 17.1 | — |
| Red Hat | Red Hat OpenStack Platform 17.1 | — |
| Red Hat | Red Hat OpenStack Platform 18.0 | — |
| Red Hat | Red Hat OpenStack Platform 18.0 | — |
References
- https://bugs.launchpad.net/keystone/+bug/2148398Exploit, Issue Tracking, Patch, Third Party Advisory
- https://security.openstack.org/ossa/OSSA-2026-015.htmlPatch, 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
Timeline
- Published
- May 28, 2026
- Last modified
- Oct 26, 2026
- NVD status
- Modified