What’s Vulnerable › Vulnerabilities
CVE-2026-66721: Apache CloudStack: Authorization issue with listHostTags for domain admins
- Severity: low (CVSS 2.7 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.5% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-08-21 · updated 2026-10-16
- Weakness: CWE-862
Description
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.
Affected products
- Apache Software Foundation Apache CloudStack: from 4.12.0.0 before 4.20.3.1; from 4.21.0.0 before 4.22.1.1 — fixed in 4.20.3.1, 4.22.1.1
How to fix
Upgrade to a fixed version: Apache Software Foundation Apache CloudStack 4.20.3.1, 4.22.1.1. Check the vendor advisory for mitigations.
References
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