Apache CloudStack 4.x UI Improper Output Escape (Lock User) VU
CVE-2026-61399 Published on August 21, 2026
Apache CloudStack: Cross-Site Scripting (XSS) Vulnerability in Lock User Function in UI
Improper Encoding or Escaping of Output vulnerability in Apache CloudStack's UI while using Lock User Functionality.
This issue affects Apache CloudStack: from 4.20.0.0 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.
Vulnerability Analysis
CVE-2026-61399 can be exploited with network access, requires user interaction and user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality and integrity, and no impact on availability.
Weakness Type
What is an Output Sanitization Vulnerability?
The software prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved.
CVE-2026-61399 has been classified to as an Output Sanitization vulnerability or weakness.
Products Associated with CVE-2026-61399
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Affected Versions
Apache Software Foundation Apache CloudStack:- Version 4.20.0.0, <= 4.20.3.0 is affected.
- Version 4.21.0.0, <= 4.22.1.0 is affected.