Authorization Flaw in Apache CloudStack's Userdata APIs
CVE-2026-50222

7.5HIGH

Key Information:

Vendor

Apache
Status
Apache Cloudstack
Vendor
CVE Published:
21 August 2026

What is CVE-2026-50222?

A significant vulnerability exists in several userdata-related APIs of Apache CloudStack, including deleteUserData, linkUserDataToTemplate, resetUserDataForVirtualMachine, deployVirtualMachine, and updateVirtualMachine. These APIs lack sufficient access control validation, which may allow unauthorized cross-tenant or cross-account access to sensitive userdata resources. Additionally, the deleteCniConfiguration API, introduced in version 4.21.0.0, exhibits similar access validation issues. Users are strongly advised to upgrade to versions 4.20.3.1 or 4.22.1.1 or later to mitigate this vulnerability.

Affected Version(s)

Apache CloudStack 4.18.0.0 <= 4.20.3.0

Apache CloudStack 4.21.0.0 <= 4.22.1.0

References

https://lists.apache.org/thread/g6cwddtjrwbh1d56wjz4cfp3f...
vendor-advisory

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Bernardo De Marco Gonçalves <bernardomg2004@gmail.com>
Yuliang Xiao <xyl1509410143@outlook.com>
Łukasz Bawolski <Lukasz.Bawolski@exea.pl>
George Chen (GitHub: geo-chen)
KQ Wu <kqmailbox@163.com>
.