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    CVE-2026-66721

    Missing authorization issue for domain admins in CloudStack's host tags listing functionality. Domain Admins, by default, have permission to call the listHostTags API, but the API returns host tags for every host in the environment without domain scoping. It should instead be restricted to only the hosts dedicated to that admin's domain. This issue affects Apache CloudStack: from 4.12.0.0 through 4.20.3.0 and from 4.21.0.0 through 4.22.1.0. Users are recommended to upgrade to version 4.20.3.1 or 4.22.1.1 or later, which fixes the issue.

    Published:Aug 21, 2026
    Last Modified:Aug 27, 2026
    EPS:Aug 21, 2026
    EPSS Score:0.00179
    CVSS Score:2.7

    Affected Products

    Vendor
    Apache
    Product
    Apache Cloudstack
    Vendor
    Apache
    Product
    Cloudstack

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-862 Missing Authorization

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-665 Exploitation of Thunderbolt Protection Flaws

    Related CVEs

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    CVE-2026-66797 (CVSS 5.4) — Improper access control in CloudStack's annotation functionality allows unauthorized comment creation and disc…
    CVE-2025-26521 (CVSS 8.1) — When an Apache CloudStack user-account creates a CKS-based Kubernetes cluster in a project, the API key and th…
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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High