Vulnerability 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).
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Openstack | Keystone | >= 14.0.0, < 27.0.2 |
Related Weaknesses (CWE)
References
- https://bugs.launchpad.net/keystone/+bug/2148398ExploitIssue TrackingPatch
- https://security.openstack.org/ossa/OSSA-2026-015.htmlPatchVendor 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
FAQ
What is CVE-2026-42999?
CVE-2026-42999 is a vulnerability with a CVSS score of 6.0 (MEDIUM). 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 v...
How severe is CVE-2026-42999?
CVE-2026-42999 has been rated MEDIUM with a CVSS base score of 6.0/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-42999?
Check the references section above for vendor advisories and patch information. Affected products include: Openstack Keystone.