id: PYSEC-2026-2549
published: "2026-07-09T16:49:45.704524Z"
modified: "2026-07-09T16:49:45.704524Z"
aliases:
- CVE-2015-7546
- GHSA-8c4w-v65p-jvcv
summary: OpenStack Identity Keystone and keystonemiddleware Insufficiently Protected Credentials
details: The identity service in OpenStack Identity (Keystone) before 2015.1.3 (Kilo) and 8.0.x before 8.0.2 (Liberty) and keystonemiddleware (formerly python-keystoneclient) before 1.5.4 (Kilo) and Liberty before 2.3.3 does not properly invalidate authorization tokens when using the PKI or PKIZ token providers, which allows remote authenticated users to bypass intended access restrictions and gain access to cloud resources by manipulating byte fields within a revoked token.
affected:
- package:
    name: keystone
    ecosystem: PyPI
    purl: pkg:pypi/keystone
  ranges:
  - type: ECOSYSTEM
    events:
    - introduced: "8.0"
    - fixed: 8.1.0
    - introduced: 9.0.0.0b1
    - fixed: 9.0.0.0b2
references:
- type: ADVISORY
  url: https://nvd.nist.gov/vuln/detail/CVE-2015-7546
- type: WEB
  url: https://github.com/openstack/keystone/commit/bff03b5726fe5cac93d44a66715eea49b89c8cb0
- type: WEB
  url: https://github.com/openstack/keystone/commit/d5378f173da14a34ca010271477337879002d6d0
- type: WEB
  url: https://github.com/openstack/keystonemiddleware/commit/96ab58e6863c92575ada57615b19652e502adfd8
- type: WEB
  url: https://bugs.launchpad.net/keystone/+bug/1490804
- type: WEB
  url: https://github.com/pypa/advisory-database/tree/main/vulns/keystonemiddleware/PYSEC-2016-20.yaml
- type: WEB
  url: https://security.openstack.org/ossa/OSSA-2016-005.html
- type: WEB
  url: https://web.archive.org/web/20200228002640/http://www.securityfocus.com/bid/80498
- type: WEB
  url: https://wiki.openstack.org/wiki/OSSN/OSSN-0062
- type: WEB
  url: http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
- type: PACKAGE
  url: https://pypi.org/project/keystone
- type: ADVISORY
  url: https://github.com/advisories/GHSA-8c4w-v65p-jvcv
severity:
- type: CVSS_V3
  score: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- type: CVSS_V4
  score: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N