CVE-2026-61399 Apache CloudStack: Cross-Site Scripting (XSS) Vulnerability in Lock User Function in UI
Attackers can execute arbitrary scripts in the CloudStack UI via the Lock User function, potentially compromising user accounts.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-61399?
CVE-2026-61399 is a medium-severity cross-site scripting vulnerability in Apache Cloudstack, published on 21 Aug 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-116
Which versions are affected by CVE-2026-61399?
It affects 1 product.
Products include Apache Cloudstack.
How do I fix CVE-2026-61399?
No fix has been published for CVE-2026-61399 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-61399 being exploited?
There is no known exploitation of CVE-2026-61399 in the wild and no public exploit code.
Other vulnerabilities in Apache Cloudstack
- CVE-2012-4501 Missing authorization in n/a
- CVE-2024-38346 Apache CloudStack: Unauthenticated cluster service port leads to remote execution
- CVE-2024-39864 Apache CloudStack: Integration API service uses dynamic port when disabled
- CVE-2024-29006 Apache CloudStack: x-forwarded-for HTTP header parsed by default
- CVE-2022-35741 Apache CloudStack SAML Single Sign-On XXE
Sources
Also known as GHSA-4rrq-73x5-wj26.