EUVD-2026-63839
GHSA-9xgp-62vf-q3qv
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Output-encoding/XSS-class flaw in the operator UI plausibly needs an authenticated session (PR:L) and a victim rendering the page (UI:R), with browser-context scope change (S:C) and limited C/I impact.
Primary rating from Vendor (apache).
CVSS VectorVendor: apache
Lifecycle Timeline
4DescriptionCVE.org
Improper Encoding or Escaping of Output vulnerability in Apache CloudStack's UI while using Instance Reset Password functionality.
This issue affects Apache CloudStack: from 4.15.1.0 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.
AnalysisAI
Improper output encoding in the Apache CloudStack management UI's Instance Reset Password feature allows injection of unescaped output that can expose sensitive data or manipulate the interface. It affects Apache CloudStack 4.15.1.0 through 4.20.3.0 and 4.21.0.0 through 4.22.1.0, an open-source IaaS cloud orchestration platform. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation targets the Apache CloudStack management UI specifically through the Instance Reset Password functionality, so a deployment must have that feature reachable and in use. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals conflict and warrant scrutiny. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: upgrade to Apache CloudStack 4.20.3.1 (for the 4.15.1.0-4.20.3.0 branch) or 4.22.1.1 (for the 4.21.0.0-4.22.1.0 branch), or later, as directed in the Apache advisory at https://lists.apache.org/thread/g6cwddtjrwbh1d56wjz4cfp3fzfm4kbc. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all Apache CloudStack deployments and identify systems running versions 4.15.1.0-4.20.3.0 or 4.21.0.0-4.22.1.0; restrict management UI access to essential administrators and prioritize any internet-exposed instances. …
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Same weakness CWE-116 – Improper Encoding or Escaping of Output
View allSame technique Information Disclosure
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External POC / Exploit Code
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