Apache CloudStack 4.18-4.22: Missing Auth on Userdata APIs
CVE-2026-50222 Published on August 21, 2026
Apache CloudStack: Improper access control in Userdata reference APIs
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.
Vulnerability Analysis
CVE-2026-50222 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity and availability.
Weakness Types
What is an AuthZ Vulnerability?
The software does not perform an authorization check when an actor attempts to access a resource or perform an action.
CVE-2026-50222 has been classified to as an AuthZ vulnerability or weakness.
What is an Information Disclosure Vulnerability?
The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
CVE-2026-50222 has been classified to as an Information Disclosure vulnerability or weakness.
Products Associated with CVE-2026-50222
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Affected Versions
Apache Software Foundation Apache CloudStack:- Version 4.18.0.0, <= 4.20.3.0 is affected.
- Version 4.21.0.0, <= 4.22.1.0 is affected.