Apache CloudStack up to 4.20.3.0/4.22.1.0 Host Tags Listing listHostTags privileges management

Summaryinfo

A vulnerability was found in Apache CloudStack up to 4.20.3.0/4.22.1.0. It has been rated as problematic. Affected by this issue is the function listHostTags of the component Host Tags Listing. Performing a manipulation results in privileges management. This vulnerability is known as CVE-2026-66721. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability classified as problematic has been found in Apache CloudStack up to 4.20.3.0/4.22.1.0. This affects the function listHostTags of the component Host Tags Listing. The manipulation with an unknown input leads to a privileges management vulnerability. CWE is classifying the issue as CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. This is going to have an impact on confidentiality. The summary by CVE is:

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.

The advisory is shared at lists.apache.org. This vulnerability is uniquely identified as CVE-2026-66721 since 07/27/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. The exploitation requires an enhanced level of successful authentication. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/21/2026). MITRE ATT&CK project uses the attack technique T1068 for this issue.

Upgrading to version 4.20.3.1 or 4.22.1.1 eliminates this vulnerability.

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Productinfo

Type

• Cloud Software

Vendor

• Apache

Name

• CloudStack

Version

• 4.20.0
• 4.20.1
• 4.20.2
• 4.20.3.0
• 4.22.0
• 4.22.1.0

License

• open-source

Website

• Vendor: https://www.apache.org/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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