Azure CycleCloud Elevation of Privilege Vulnerability
Published July 14, 2026Updated July 14, 2026
Source data
Overview
Missing authentication for critical function in Azure CycleCloud allows an authorized attacker to elevate privileges over a network.
Impact & technical details
Elevation of Privilege
How could an attacker exploit this vulnerability? An authenticated user who has the Cluster Creator role could exploit this vulnerability by using a cluster creation operation in a way that bypasses an authorization check. By doing so, the attacker could overwrite another user’s cluster, including a cluster owned by an administrator, and take ownership of it.
What privileges could be gained by an attacker who successfully exploited the vulnerability? An attacker who successfully exploited this vulnerability could gain full control of the affected cluster that was overwritten and taken over. This could allow the attacker to run unauthorized code, remove or alter credentials associated with the cluster, and perform actions with the same level of access available within that cluster.
What do I need to do to protect myself? Customers should update to Azure CycleCloud 8.9.1 (Build 8.9.1-3806), which includes the fix for this vulnerability. New installations and upgrades to an existing CycleCloud deployment will receive the updated packages containing the fix. For installation and upgrade guidance, see: Install CycleCloud Upgrade an existing CycleCloud installation Updated packages are available through Microsoft's package repositories and the Azure Marketplace image for CycleCloud 8.9.1.
- CVSS base score
- 8.8 / 10
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Highest base score supplied by MSRC for this record; the vector belongs to that score. Ratings can vary by product. Microsoft Important is displayed as High; Moderate is displayed as Medium.
Affected products
- Azure CycleCloud 8.9.1
Source guidance
Remediation
- Release Notes
At least one Microsoft vendor-fix reference is available. Check each affected product for its applicable update, prerequisites, and supported version.
GTP recommendation · Rule-based guidance
Recommended next step
Review affected Microsoft products and apply the applicable security updates through your organization's normal patch-management process. Confirm availability and prerequisites in the Microsoft advisory.
Authoritative sources & updates
Findings and update information come from the linked publishers. GTP compiles the public record and provides the recommendation above. CVSS ratings shown here come from Microsoft. NVD references provide additional public context.
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Griffin Technology Partners managed customers may receive additional environment-specific security guidance and remediation assistance through their managed services relationship.
Security bulletins are provided for informational purposes and compiled from authoritative public sources. Vulnerability applicability varies by environment. Validate affected products, configuration, compatibility requirements, and vendor guidance before making production changes.