CVE-2026-61399: CWE-116 Improper Encoding or Escaping of Output in Apache Software Foundation Apache CloudStack
Description
CVE-2026-61399 is an improper encoding or escaping of output vulnerability in the Apache CloudStack UI related to the Lock User functionality. It affects versions from 4.20.0.0 through 4.20.3.0 and 4.21.0.0 through 4.22.1.0. The issue is fixed in versions 4.20.3.1 and 4.22.1.1 or later. The vulnerability has a medium severity with a CVSS score of 4.8.
CVSS v3.1
Score 4.8medium
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
This vulnerability (CVE-2026-61399) in Apache CloudStack involves improper encoding or escaping of output in the UI when using the Lock User functionality. This could potentially lead to issues such as cross-site scripting or other output-based attacks. The affected versions are from 4.20.0.0 up to and including 4.20.3.0 and from 4.21.0.0 up to and including 4.22.1.0. The Apache Software Foundation has released fixed versions 4.20.3.1 and 4.22.1.1 that address this vulnerability.
Potential Impact
The vulnerability allows improper encoding or escaping of output in the UI, which could lead to limited confidentiality and integrity impacts as indicated by the CVSS vector (C:L/I:L). There is no impact on availability. The attack complexity is low, but requires high privileges and user interaction. The scope is changed, indicating potential impact beyond the vulnerable component.
Mitigation Recommendations
Users should upgrade Apache CloudStack to version 4.20.3.1 or 4.22.1.1 or later to remediate this vulnerability. No other mitigation steps are indicated or necessary once the upgrade is applied.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apache
- Date Reserved
- 2026-07-09T08:10:28.174Z
- State
- PUBLISHED
Threat ID: 6a88309facd9273b4907b8a1
Added to database: 08/21/2026, 11:03:59 UTC
Last enriched: 09/11/2026, 03:04:01 UTC
Last updated: 10/05/2026, 18:48:21 UTC
Views: 66
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