CVE-2026-66797: CWE-284 Improper Access Control in Apache Software Foundation Apache CloudStack
Description
CVE-2026-66797 is an improper access control vulnerability in Apache CloudStack's annotation functionality. It allows any authenticated user to create and view annotations on entities they do not own by bypassing ownership checks. The flaw affects versions from 4.15.0.0 through 4.20.3.0 and 4.21.0.0 through 4.22.1.0. Fixed versions are 4.20.3.1 and 4.22.1.1 or later.
CVSS v3.1
Score 5.4medium
Affected software
Apache Software Foundation
Apache CloudStack
pkg:maven/org.apache.cloudstack/cloudstackRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in Apache CloudStack arises because the addAnnotation and listAnnotation APIs perform an ownership check when an entity's UUID is specified but do not correctly enforce the result. This improper access control (CWE-284) enables any authenticated user to write annotations to and disclose existing annotations on entities they do not own by supplying the entity's UUID. This affects Apache CloudStack versions 4.15.0.0 through 4.20.3.0 and 4.21.0.0 through 4.22.1.0. The issue is resolved in versions 4.20.3.1 and 4.22.1.1 or later.
Potential Impact
An attacker with valid authentication can create and view annotations/comments on entities they do not own, potentially leading to unauthorized disclosure of information and unauthorized modification of annotations. The CVSS score is 5.4 (medium severity), indicating limited confidentiality and integrity impact without availability impact.
Mitigation Recommendations
Users should upgrade Apache CloudStack to version 4.20.3.1 or 4.22.1.1 or later, where this improper access control vulnerability has been fixed. No other mitigation is indicated or required according to the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apache
- Date Reserved
- 2026-07-27T18:09:26.783Z
- State
- PUBLISHED
Threat ID: 6a88309facd9273b4907b8af
Added to database: 08/21/2026, 11:03:59 UTC
Last enriched: 09/11/2026, 03:03:36 UTC
Last updated: 10/05/2026, 18:48:21 UTC
Views: 69
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