---
id: CVE-2026-93854
title: >-
  In OpenStack Blazar before 17.0.1, the V2 lease API does not enforce
  object-level authorization on its update and delete operations (PUT
  /v2/leases/{lease_id} and DELETE /v2/leases/{lease_id})
summary: >-
  In OpenStack Blazar before 17.0.1, the V2 lease API does not enforce
  object-level authorization on its update and delete operations (PUT
  /v2/leases/{lease_id} and DELETE /v2/leases/{lease_id}). The policy
  authorize() wrapper attempts to …
severity: high
cvss: 7.2
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N'
cwe:
  - CWE-1025
vendor: OpenStack
product: Blazar
affected:
  - Blazar >= 1.0.0 < 15.1.1
  - Blazar >= 16.0.0 < 16.0.1
  - Blazar >= 17.0.0 < 17.0.1
published: '2026-09-18'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T19:56:19.073'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93854'
references:
  - url: 'https://launchpad.net/bugs/2162719'
    label: cve@mitre.org
tags:
  - nvd
  - cve.org
epss: 0.00406
epssPercentile: 0.3212
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-22T15:19:18.318576Z'
cvssSource: cna
ingestedAt: '2026-09-18T19:49:30.582Z'
---

## Overview

In OpenStack Blazar before 17.0.1, the V2 lease API does not enforce object-level authorization on its update and delete operations (PUT /v2/leases/{lease_id} and DELETE /v2/leases/{lease_id}). The policy authorize() wrapper attempts to load the target lease to build the authorization target from its owner, but it looks up the lease under the keyword "lease_id" whereas the controller methods name the parameter "id" (and the wsme_pecan.wsexpose wrapper delivers it positionally). The lookup returns None, and thus authorization falls back to the requesting user's own project_id/user_id instead of the target lease owner. Any authenticated user who knows a lease ID can therefore modify or delete leases belonging to other users and projects, bypassing the intended ownership check.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.