Description
Missing Authorization, Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Apache CloudStack's Userdata reference APIs.
Several userdata-related APIs in Apache CloudStack, including deleteUserData, linkUserDataToTemplate, resetUserDataForVirtualMachine, deployVirtualMachine, and updateVirtualMachine, exhibit missing or insufficient access control validation, potentially allowing cross-tenant/cross-account access to userdata resources that belong to other tenants.
This issue affects Apache CloudStack: from 4.18.0.0 through 4.20.3.0 and from 4.21.0.0 through 4.22.1.0.
The deleteCniConfiguration API, introduced in 4.21.0.0, also exhibits similar behaviour and lacks access validation.
Users are recommended to upgrade to version 4.20.3.1 or 4.22.1.1 or later, which fixes the issue.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache Software Foundation | Apache CloudStack | 4.18.0.0 – ≤ 4.20.3.0, 4.21.0.0 – ≤ 4.22.1.0 | — |
Advisories 2
- NCSC-2026-0332 Kwetsbaarheden verholpen in Apache CloudStack NCSC-NL (Netherlands) · Aug 27, 2026
- WID-SEC-2026-2962 Apache CloudStack: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 23, 2026
References
- https://lists.apache.org/thread/g6cwddtjrwbh1d56wjz4cfp3fzfm4kbc vendor-advisory