CVE-2026-50222 Apache Software Foundation CVE debrief

Who should care

Apache CloudStack users and administrators should be aware of this vulnerability and take steps to upgrade to a patched version and review access controls for userdata resources. This includes operators, platform administrators, vulnerability management teams, and security teams who need to assess and mitigate potential exposure to this vulnerability. Users should prioritize upgrading to version 4.20.3.1 or 4.22.1.1 or later due to potential cross-tenant/cross-account access to userdata resources. Additionally, users should review compensating controls for exposed systems while remediation is scheduled and verified, and check relevant monitoring, detection, and logs for exposed assets that need extra review. Users should also track exceptions, retest remediated assets, and close the item only after evidence is documented. Finally, users should confirm whether affected product deployments exist in managed environments and assign an owner for follow-up. This may involve reviewing the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance, and planning vendor-supported updates or mitigations through normal change control where exposure is confirmed. Users should also consider asset inventory and rollback/change windows as part of their remediation plan. Source tracking may also be necessary to ensure that all affected systems are identified and remediated. Monitoring for potential cross-tenant/cross-account access to userdata resources is also recommended. Overall, a comprehensive review of the affected systems and a thorough remediation plan are necessary to address this vulnerability effectively. This may involve coordination with multiple teams, including IT, security, and compliance, to ensure that all necessary steps are taken to mitigate the vulnerability and prevent future exploitation. By taking a proactive and thorough approach to remediation, users can minimize the risk of exploitation and protect their systems and data from potential harm. It is also recommended to review and adjust access controls for userdata resources, and to prioritize upgrading to a patched version of Apache CloudStack. Additionally, users

Technical summary

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. The deleteCniConfiguration API, introduced in 4.21.0.0, also lacks access validation.

Defensive priority

Apache CloudStack users should prioritize upgrading to version 4.20.3.1 or 4.22.1.1 or later due to potential cross-tenant/cross-account access to userdata resources.

Recommended defensive actions

• Upgrade to Apache CloudStack version 4.20.3.1 or 4.22.1.1 or later
• Review and adjust access controls for userdata resources
• Monitor for potential cross-tenant/cross-account access to userdata resources
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE-2026-50222 issue affects Apache CloudStack versions from 4.18.0.0 through 4.20.3.0 and from 4.21.0.0 through 4.22.1.0, with several userdata-related APIs exhibiting missing or insufficient access control validation. Users should verify their deployments and review access controls for userdata resources. Evidence is limited to public CVE and NVD details.

Official resources