CVE-2026-42999
MediumCVSS 6.0Exploitation Probability (EPSS)
Low risk25th percentile - higher than 25% of all known CVEs
Summary
In OpenStack Keystone before version 29.0.2, a vulnerability was found in the RBAC policy enforcement mechanism. The enforce_call function unconditionally merges raw JSON from the HTTP request into the policy dictionary, overwriting trusted data from database lookups. This allows an authenticated user to inject arbitrary attributes (e.g., user_id, project_id) and bypass access controls.
Risk Assessment
The organization is at risk of unauthorized access to resources belonging to other users or projects, potentially leading to data confidentiality and integrity breaches in the OpenStack cloud.
Recommendation
Immediately upgrade OpenStack Keystone to version 29.0.2 or later, which includes a fix for this vulnerability.
Original NVD description (English source)
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).