Apache CloudStack up to 4.20.3.0/4.22.1.0 Annotation addAnnotation/listAnnotation uuid access control

Summaryinfo

A vulnerability, which was classified as critical, was found in Apache CloudStack up to 4.20.3.0/4.22.1.0. The impacted element is the function addAnnotation/listAnnotation of the component Annotation. Executing a manipulation of the argument uuid can lead to access control. This vulnerability is registered as CVE-2026-66797. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability has been found in Apache CloudStack up to 4.20.3.0/4.22.1.0 and classified as critical. This vulnerability affects the function addAnnotation/listAnnotation of the component Annotation. The manipulation of the argument uuid with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Improper access control in CloudStack's annotation functionality allows unauthorized comment creation and disclosure. The addAnnotation and listAnnotation APIs perform an ownership check when an entity's UUID is specified, but fail to honor its result correctly. This lets any authenticated user write annotations to, and disclose existing annotations/comments on, an entity they don't own by simply supplying its UUID. This issue affects Apache CloudStack: from 4.15.0.0 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 for download at lists.apache.org. This vulnerability was named CVE-2026-66797 since 07/27/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/21/2026). The MITRE ATT&CK project declares the attack technique as T1068.

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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