CVE-2026-59655 Apache Software Foundation CVE debrief

Who should care

Users of Apache CloudStack versions 4.19.0.0 through 4.20.3.0 and 4.21.0.0 through 4.22.1.0 should be aware of this vulnerability and take necessary actions to protect their systems. This includes operators, platform administrators, vulnerability management teams, and security teams responsible for ensuring the security and integrity of their CloudStack deployments.

Technical summary

The OAuth authentication plugin in Apache CloudStack exposes sensitive information to unauthorized actors when listing OAuth providers. This issue affects Apache CloudStack versions from 4.19.0.0 through 4.20.3.0 and from 4.21.0.0 through 4.22.1.0. The vulnerability is addressed in versions 4.20.3.1 and 4.22.1.1 or later. Technical teams should review the vulnerability details and assess the impact on their deployments.

Defensive priority

Upgrade to fixed version 4.20.3.1 or 4.22.1.1.

Recommended defensive actions

• Upgrade to version 4.20.3.1 or 4.22.1.1 or later
• Inventory affected systems
• Monitor for unauthorized access attempts
• 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

Official CVE and NVD records provide limited information; verification needed. The OAuth authentication plugin in Apache CloudStack exposes sensitive information to unauthorized actors when listing OAuth providers. This issue affects Apache CloudStack versions from 4.19.0.0 through 4.20.3.0 and from 4.21.0.0 through 4.22.1.0. The vulnerability is addressed in versions 4.20.3.1 and 4.22.1.1 or later. Evidence of exposure and potential impact should be verified by defenders.

Official resources