OpenStack Keystone has an Authorization Bypass
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).
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-42999US | high8.8OT elevated | — | ||
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 enfo… | ||||
references
External citations — patches, advisories, analysis.
- https://access.redhat.com/security/cve/CVE-2026-42999WEB
- https://bugs.launchpad.net/keystone/+bug/2148398WEB
- https://bugzilla.redhat.com/show_bug.cgi?id=2482840WEB
- https://github.com/openstack/keystonePACKAGE
- https://github.com/pypa/advisory-database/tree/main/vulns/keystone/PYSEC-2026-600.yamlWEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-42999ADVISORY
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42999.jsonWEB
- https://security.openstack.org/ossa/OSSA-2026-015.htmlWEB
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