Executive brief
Microsoft Azure CycleCloud, a tool used for managing large-scale computing clusters, contains a security flaw that allows an existing user to gain higher-level administrative permissions. By exploiting a lack of authentication for certain critical functions, an attacker could take full control of the cluster management environment. This could lead to unauthorized access to sensitive data, disruption of computing operations, or the ability to modify infrastructure settings.
Technical details
A privilege escalation vulnerability exists in Microsoft Azure CycleCloud due to missing authentication for a critical function (CWE-306). An attacker with low-privileged network access to the CycleCloud interface can bypass intended access controls to execute administrative actions. This flaw allows for a complete compromise of confidentiality, integrity, and availability within the affected environment. The vulnerability is addressed in Azure CycleCloud version 8.9.1.
Affected products
- Microsoft Azure CycleCloud 1.0.0 to 8.9.0
Timeline
- 2026-07-14: disclosed
- 2026-07-14: advisory