UBUNTU-CVE-2026-42999

Advisory lineage Upstream: 1 Downstream: 1
Upstream
CVE-2026-42999
Downstream
USN-8433-1
Published: 28 May 2026, 19:16
Last modified:30 Jun 2026, 18:18

Vulnerability Summary

Overall Risk (default)
medium
35/100
CVSS Score
8.8 HIGH
3.1 (osv_ubuntu)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

28 May 2026, 19:16
Published
Vulnerability first disclosed
30 Jun 2026, 18:18
Last Modified
Vulnerability information updated

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 Metrics

  • v3.1•HIGH•Score: 8.8CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Systems

  • ubuntu•keystone

    all | all | all | all | all | all | all | < 2:21.0.1-0ubuntu2.4 | < 2:25.0.0-0ubuntu1.4 | < 2:28.0.0-0ubuntu1.3 | < 2:29.0.0-0ubuntu1.2

References (5)