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CVE-2026-66721— Apache CloudStack: Authorization issue with listHostTags for domain admins

Quick assessment

Affected
Apache Software Foundation Apache CloudStack
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache cloudstack是美国Apache基金会开源的一套云计算管理平台。 Apache CloudStack 4.12.0.0版本至4.20.3.0版本和4.21.0.0版本至4.22.1.0版本存在授权问题漏洞，该漏洞源于主机标签列表功能缺少授权，域管理员调用listHostTags API时未进行域范围限制，可能获取环境中所有主机的标签信息。

AI Predicted 5.3 Difficulty: Easy EPSS 0.48% · P39

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 2

VendorProduct Version RangeStatus
Apache Software Foundation Apache CloudStack 4.12.0.0≤ 4.20.3.0 affected
4.21.0.0≤ 4.22.1.0 affected
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I. Basic Information for CVE-2026-66721

Vulnerability Information
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Vulnerability Title
Apache CloudStack: Authorization issue with listHostTags for domain admins
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Apache CloudStack 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache cloudstack是美国Apache基金会开源的一套云计算管理平台。 Apache CloudStack 4.12.0.0版本至4.20.3.0版本和4.21.0.0版本至4.22.1.0版本存在授权问题漏洞，该漏洞源于主机标签列表功能缺少授权，域管理员调用listHostTags API时未进行域范围限制，可能获取环境中所有主机的标签信息。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache CloudStack 4.12.0.0 ~ 4.20.3.0 -

II. Public POCs for CVE-2026-66721

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III. Intelligence Information for CVE-2026-66721

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Mailing List Discussions for CVE-2026-66721 (1)

Same Patch Batch · Apache Software Foundation · 2026-08-21 · 21 CVEs total

CVE-2026-59654 6.8 MEDIUM Apache CloudStack: DoS caused by database connections leak
CVE-2026-59799 Apache CloudStack: Missing Privilege Check in Two-Factor Authentication Disable Flow
CVE-2026-63046 Apache InLong: Agent Installer — Command Injection to RCE via Default Credentials
CVE-2026-47359 Apache CloudStack: OS Command Injection due to unsanitized mount command
CVE-2026-50112 Apache CloudStack: RCE and SSRF in direct download, metalink and NFS templates
CVE-2026-50222 Apache CloudStack: Improper access control in Userdata reference APIs
CVE-2026-59085 Apache CloudStack: Server-Side Request Forgery (SSRF) vulnerability in webhook module
CVE-2026-59655 Apache CloudStack: Unauthenticated OAuth provider client-secret disclosure
CVE-2026-59657 Apache CloudStack: Sensitive Information Disclosure via Cleartext Storage in AsyncJob
CVE-2026-59780 Apache CloudStack: LDAP provider configuration disclosure
CVE-2026-68745 Apache CloudStack: SAML2 Signature Validation Silently Skipped for Cert-less IdP
CVE-2026-61397 Apache CloudStack: OAuth2 Token Cross-Request Leak
CVE-2026-61398 Apache CloudStack: Cross-Site Scripting (XSS) Vulnerability in Instance Reset Password Fun
CVE-2026-61399 Apache CloudStack: Cross-Site Scripting (XSS) Vulnerability in Lock User Function in UI
CVE-2026-61400 Apache CloudStack: Get and Run Diagnostics Command Injection
CVE-2026-61422 Apache CloudStack: Authenticated pre-validation SSRF in registerTemplate
CVE-2026-62440 Apache CloudStack: Improper access control in Kubernetes Service (CKS) cluster manipulatio
CVE-2026-65613 Apache CloudStack: Webhook Deliveries Incorrect Access
CVE-2026-66722 Apache CloudStack: ProjectRole & ProjectRolePermission authorization issue
CVE-2026-66797 Apache CloudStack: Unauthorised comment creation and disclosure

IV. Related Vulnerabilities

Same product: Apache CloudStack
Same vendor: Apache Software Foundation
Same weakness: CWE-862

V. Comments for CVE-2026-66721

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