{"id":"CVE-2026-42999","aliases":["GHSA-2r23-2g6v-2m5f","PYSEC-2026-600"],"url":"https://o3.security/vulnerability/CVE-2026-42999","summary":"OpenStack Keystone has an Authorization Bypass","details":"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).","published":"2026-05-28T00:00:00Z","modified":"2026-08-12T03:51:19.038798638Z","cvss":{"score":6,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L"},"epss":{"score":0.00329,"percentile":0.25892,"asOf":"2026-08-16"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"keystone","fixedVersion":"27.0.2"},{"ecosystem":"PyPI","name":"keystone","fixedVersion":"28.0.2"},{"ecosystem":"PyPI","name":"keystone","fixedVersion":"29.0.2"}],"fix":null,"references":[{"type":"WEB","url":"https://bugs.launchpad.net/keystone/+bug/2148398"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42999.json"},{"type":"WEB","url":"https://security.openstack.org/ossa/OSSA-2026-015.html"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-42999"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42999.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42999"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2482840"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:19.038798638Z"}}