CVE-2026-61398 Apache Software Foundation CVE debrief

Who should care

Apache CloudStack users and administrators should be aware of this vulnerability and take necessary actions to upgrade to a fixed version. Affected operators, platform administrators, vulnerability management teams, and security teams should review the official advisory and CVE record to validate affected scope, severity, and vendor guidance. They should also plan vendor-supported updates or mitigations through normal change control where exposure is confirmed and track exceptions, retest remediated assets, and close the item only after evidence is documented. Additionally, they should check relevant monitoring, detection, and logs for exposed assets that need extra review and review compensating controls for exposed systems while remediation is scheduled and verified. Users with affected deployments should confirm whether affected product deployments exist in managed environments and assign an owner for follow-up. They should also monitor for potential exploitation attempts within their environments and review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance. Finally, they should plan vendor-supported updates or mitigations through normal change control where exposure is confirmed and review compensating controls for exposed systems while remediation is scheduled and verified. This should be done while keeping in mind that evidence is limited to CVE and NVD details, and defenders should verify affected deployments, review official advisories, and monitor for potential exploitation attempts within their environments. Therefore, they should proceed with caution and take necessary actions to protect their systems. Moreover, they should consider the operational impact of this vulnerability on their systems and take steps to mitigate it. The affected versions and the severity of the vulnerability make it essential for users to take immediate action and prioritize upgrading to a fixed version. The vulnerability's impact on affected deployments and the importance of verifying affected deployments make it crucial for users to be aware of this vulnerability and take necessary actions to protect their systems. The CVE

Technical summary

The vulnerability is caused by improper encoding or escaping of output in Apache CloudStack's UI when using the Instance Reset Password functionality. This issue affects Apache CloudStack versions from 4.15.1.0 through 4.20.3.0 and from 4.21.0.0 through 4.22.1.0. Users should prioritize upgrading to version 4.20.3.1 or 4.22.1.1 or later. The vulnerability has a high impact on affected deployments, and defenders should review compensating controls for exposed systems while remediation is scheduled and verified.

Defensive priority

Apache CloudStack users should prioritize upgrading to version 4.20.3.1 or 4.22.1.1 or later.

Recommended defensive actions

• Upgrade to version 4.20.3.1 or 4.22.1.1 or later
• Review and adjust Instance Reset Password functionality usage
• Monitor for potential exploitation attempts
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record indicates an Improper Encoding or Escaping of Output vulnerability in Apache CloudStack's UI while using Instance Reset Password functionality. Affected versions are from 4.15.1.0 through 4.20.3.0 and from 4.21.0.0 through 4.22.1.0. Evidence is limited to CVE and NVD details. Defenders should verify affected deployments, review official advisories, and monitor for potential exploitation attempts within their environments.

Official resources