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CVE-2026-66797 Details

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: CISA-ADPCVSS-B:5.4 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://lists.apache.org/thread/g6cwddtjrwbh1d56wjz4cfp3fzfm4kbc	[email protected]	Mailing ListVendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-284	Improper Access Control	[email protected]

Affected Products

Product	Versions
apache cloudstack	>= 4.15.0.0, < 4.20.3.1 >= 4.21.0.0, < 4.22.1.1
CPE cpe:2.3:a:apache:cloudstack:::::::: Remediation No remediation found in references.

Change History

3 change records found show changes

Date	Action	Recorded By
Aug 27, 2026	Initial Analysis	[email protected]
Aug 21, 2026	CVE Modified	CISA-ADP
Aug 21, 2026	New CVE Received	[email protected]