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8.8

OpenStack Keystone allows unauthorized access by users

CVE-2026-42999 · published 5 months ago
Summary

OpenStack Keystone, a component of OpenStack, has a security issue that allows any authenticated user to access resources they shouldn't have access to. This is a significant risk because it can be exploited by any user, not just administrators. To protect against this issue, update OpenStack Keystone to version 29.0.2 or later.

What to do
  • Update openstack keystone to version 27.0.2.
  • Update openstack keystone to version 28.0.2.
  • Update openstack keystone to version 29.0.2.
  • Update canonical keystone to version 2:21.0.1-0ubuntu2.4.
  • Update canonical keystone to version 2:25.0.0-0ubuntu1.4.
  • Update canonical keystone to version 2:28.0.0-0ubuntu1.3.
  • Update canonical keystone to version 2:29.0.0-0ubuntu1.2.
  • Update debian keystone to version 2:22.0.2-0+deb12u3.
  • Update debian keystone to version 2:27.0.0-3+deb13u4.
  • Update debian keystone to version 2:29.0.1-2.
Affected software
Ecosystem VendorProductAffected versions
Debian:11 debian keystone All versions
Debian:12 debian keystone < 2:22.0.2-0+deb12u3
Fix: upgrade to 2:22.0.2-0+deb12u3
Debian:13 debian keystone < 2:27.0.0-3+deb13u4
Fix: upgrade to 2:27.0.0-3+deb13u4
Debian:14 debian keystone < 2:29.0.1-2
Fix: upgrade to 2:29.0.1-2
– openstack keystone >= 14.0.0, < 27.0.2
>= 28.0.0, < 28.0.2
>= 29.0.0, < 29.0.2
< 27.0.2
cpe:2.3:a:openstack:keystone:*:*:*:*:*:*:*:*
pip openstack keystone >= 14.0.0, < 27.0.2
>= 28.0.0, < 28.0.2
>= 29.0.0, < 29.0.2
Fix: upgrade to 27.0.2
Ubuntu:16.04:LTS canonical keystone All versions
Ubuntu:18.04:LTS canonical keystone All versions
Ubuntu:Pro:20.04:LTS canonical keystone All versions
Ubuntu:22.04:LTS canonical keystone < 2:21.0.1-0ubuntu2.4
Fix: upgrade to 2:21.0.1-0ubuntu2.4
Ubuntu:24.04:LTS canonical keystone < 2:25.0.0-0ubuntu1.4
Fix: upgrade to 2:25.0.0-0ubuntu1.4
Ubuntu:25.10 canonical keystone < 2:28.0.0-0ubuntu1.3
Fix: upgrade to 2:28.0.0-0ubuntu1.3
Ubuntu:26.04:LTS canonical keystone < 2:29.0.0-0ubuntu1.2
Fix: upgrade to 2:29.0.0-0ubuntu1.2
Original advisory text
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).
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker partial control
Severity
8.8 High
Exploitation
<1% chance of attack within 30 days
Type
CWE-863Incorrect Authorization
CWE-639Authorization Bypass Through User-Controlled Key
Timeline
Published28 May 2026
Updated4 Nov 2026
First seen28 May 2026
Sources
DEBIAN-CVE-2026-42999 · OSV
UBUNTU-CVE-2026-42999 · OSV
CVE-2026-42999 · NVD
GHSA-2r23-2g6v-2m5f · GHSA
PYSEC-2026-600 · OSV
CVE-2026-42999 · MITRE
CVE-2026-42999 · OSV
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