Executive brief
Apache CloudStack is an open-source cloud infrastructure management platform used to deploy and manage virtual machines across large distributed environments. Multiple userdata-related APIs lack proper access controls, allowing one tenant or account holder to access, modify, or delete sensitive configuration data belonging to other tenants. This could expose operational secrets, credentials, and deployment configurations across organizational boundaries.
Technical details
The vulnerability is a missing authorization flaw in several userdata reference APIs including deleteUserData, linkUserDataToTemplate, resetUserDataForVirtualMachine, deployVirtualMachine, updateVirtualMachine, and the deleteCniConfiguration API (introduced in 4.21.0.0). These APIs fail to properly validate that the requesting principal owns or has permission to access the target userdata resources, enabling cross-tenant access. The issue is network-reachable and exploitable by authenticated cloud users without special privileges. An attacker can read, modify, or delete userdata belonging to other tenants. Patches are available in versions 4.20.3.1, 4.22.1.1, and later.
Affected products
- Apache CloudStack 4.18.0.0 through 4.20.3.0, 4.21.0.0 through 4.22.1.0
Timeline
- 2026-08-21: disclosed