CVE-2026-61399 Apache Software Foundation CVE debrief

Who should care

Users of Apache CloudStack versions from 4.20.0.0 through 4.20.3.0 and from 4.21.0.0 through 4.22.1.0 should review and apply security patches. Operators, platform administrators, and security teams should verify affected deployments and review compensating controls. Evidence is limited to CVE and NVD details. Defenders should verify affected Apache CloudStack deployments and review vendor guidance. Security teams should track exceptions, retest remediated assets, and close the item only after evidence is documented. Security teams should confirm whether affected product deployments exist in managed environments and assign an owner for follow-up. Security teams should review compensating controls for exposed systems while remediation is scheduled and verified. Security teams should check relevant monitoring, detection, and logs for exposed assets that need extra review. Security teams should plan vendor-supported updates or mitigations through normal change control where exposure is confirmed. Security teams should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance. Security teams should monitor for suspicious activity. Security teams should track exceptions, retest remediated assets, and close the item only after evidence is documented. Security teams should confirm whether affected product deployments exist in managed environments and assign an owner for follow-up. Security teams should review compensating controls for exposed systems while remediation is scheduled and verified. Security teams should check relevant monitoring, detection, and logs for exposed assets that need extra review. Security teams should plan vendor-supported updates or mitigations through normal change control where exposure is confirmed. Security teams should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance. Security teams should monitor for suspicious activity. Security teams should track exceptions, retest remediated assets, and close the item only after evidence is documented. Security teams should confirm whether affected product deployments exist in managed or in

Technical summary

The vulnerability is caused by improper encoding or escaping of output in Apache CloudStack's UI when using the Lock User Functionality. This issue affects Apache CloudStack versions from 4.20.0.0 through 4.20.3.0 and from 4.21.0.0 through 4.22.1.0. The vulnerability has a medium priority due to limited scope. Limited evidence exists to support claims of vulnerability impact. Defenders should review CVE and NVD details for further information.

Defensive priority

Medium priority due to limited scope.

Recommended defensive actions

• Upgrade to version 4.20.3.1 or 4.22.1.1 or later
• Review and apply security patches
• Monitor for suspicious activity
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-08-21T09:16:39.603Z. The NVD entry is currently Received. Evidence is limited to CVE and NVD details. Defenders should verify affected Apache CloudStack deployments and review vendor guidance.

Official resources