id: PYSEC-2026-2520
published: "2026-07-13T15:15:37.289488Z"
modified: "2026-07-13T16:04:18.035127Z"
aliases:
- CVE-2026-43002
- GHSA-vxvf-xvm3-p8j5
summary: OpenStack Horizon has Incorrect Behavior Order
details: An issue was discovered in OpenStack Horizon 25.6 and 25.7 before 25.7.3. There is a write operation to the session storage backend before authentication and thus storage can be exhausted by unauthenticated requests. This is a regression of the CVE-2014-8124 fix.
affected:
- package:
    name: horizon
    ecosystem: PyPI
    purl: pkg:pypi/horizon
  ranges:
  - type: ECOSYSTEM
    events:
    - introduced: "25.6"
    - fixed: 25.7.3
  versions:
  - 25.6.0
  - 25.7.0
  - 25.7.1
  - 25.7.2
references:
- type: ADVISORY
  url: https://nvd.nist.gov/vuln/detail/CVE-2026-43002
- type: WEB
  url: https://bugs.launchpad.net/horizon/+bug/2150331
- type: PACKAGE
  url: https://github.com/openstack/horizon
- type: WEB
  url: https://security.openstack.org/ossa/OSSA-2026-009.html
- type: WEB
  url: https://www.openwall.com/lists/oss-security/2026/05/05/7
- type: PACKAGE
  url: https://pypi.org/project/horizon
- type: ADVISORY
  url: https://github.com/advisories/GHSA-vxvf-xvm3-p8j5
severity:
- type: CVSS_V3
  score: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L