CVE-2026-93852 Missing authorization in Blazar
Authenticated users can enumerate other tenants' leases due to missing project scoping, enabling subsequent modification or deletion of resources.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-93852?
CVE-2026-93852 is a high-severity missing authorization vulnerability in OpenStack Blazar, published on 18 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-862
Which versions are affected by CVE-2026-93852?
How do I fix CVE-2026-93852?
Upgrade to a fixed version.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-93852 being exploited?
There is no known exploitation of CVE-2026-93852 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-93852, GHSA-rf22-mxh9-4qvf, UBUNTU-CVE-2026-93852.