OpenStack Blazar up to 15.1.0/16.0.0/17.0.0 V2 Lease API authorize ID improper authorization

Summaryinfo

A vulnerability, which was classified as very critical, was found in OpenStack Blazar up to 15.1.0/16.0.0/17.0.0. The affected element is the function authorize of the component V2 Lease API. Executing a manipulation of the argument ID can lead to improper authorization. This vulnerability is registered as CVE-2026-93854. It is possible to launch the attack remotely. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as very critical was found in OpenStack Blazar up to 15.1.0/16.0.0/17.0.0. This vulnerability affects the function authorize of the component V2 Lease API. The manipulation of the argument id with an unknown input leads to a improper authorization vulnerability. The CWE definition for the vulnerability is CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at launchpad.net. This vulnerability was named CVE-2026-93854 since 09/18/2026. The exploitation appears to be easy. The attack can be initiated remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 09/18/2026). This vulnerability is assigned to T1548.002 by the MITRE ATT&CK project.

Upgrading to version 15.1.1, 16.0.1 or 17.0.1 eliminates this vulnerability.

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Productinfo

Type

• Cloud Software

Vendor

• OpenStack

Name

• Blazar

Version

• 15.0
• 15.1.0
• 16.0
• 17.0

License

• free

Website

• Vendor: https://www.openstack.org/

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