CVE-2026-93852: Openstack Blazar

High severity, CVSS 7.1. EPSS: 0.4% chance of exploitation in the next 30 days.

In OpenStack Blazar before 17.0.1, the V2 lease listing operation (GET /v2/leases) returns leases for every project without enforcing project scoping or an administrator-only policy. Any authenticated user with access to the Blazar REST API can enumerate leases belonging to other tenants, exposing lease IDs, reservation IDs, resource IDs, and reservation metadata. The exposed lease IDs also enable the object-level authorization bypass tracked in the companion request, allowing an attacker to then modify or delete the enumerated leases.

Affected products

• Openstack Blazar: from 1.0.0, before 15.1.1 (fixed in 15.1.1); from 16.0.0, before 16.0.1 (fixed in 16.0.1); from 17.0.0, before 17.0.1 (fixed in 17.0.1)

Published 2026-09-18. Last modified 2026-09-22.