An issue was discovered in OpenStack Cinder before 19.1.2, 20.x before 20.0.2, and 21.0.0.

Glance before 23.0.1, 24.x before 24.1.1, and 25.0.0.

and Nova before 24.1.2, 25.x before 25.0.2, and 26.0.0. By supplying a specially created VMDK flat image that references a specific backing file path, an authenticated user may convince systems to return a copy of that file's contents from the server, resulting in unauthorized access to potentially sensitive data.