What is the CVSS score of CVE-2026-17527?

CVE-2026-17527 has a CVSS 3.1 base score of 7.7 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N. EPSS exploitation probability: 0.4%.

Which versions of In are affected by CVE-2026-17527?

The containerized-data-importer (CDI) contains a privilege separation flaw that allows authenticated users with cluster-wide view and write access to exfiltrate PersistentVolumeClaim (PVC) data…

How to fix or mitigate CVE-2026-17527?

Within 24 hours, identify all users and service accounts with cluster-wide view and write permissions and audit their actual need for such access; temporarily restrict unnecessary write access to critical namespaces. Within 7 days, implement strict RBAC policies to limit PVC creation/cloning operations to only required principals and consider deploying network policies to block cross-namespace data movement. Within 30 days, evaluate and apply any upstream security patches or workarounds as they become available, and enhance monitoring for anomalous PVC clone activity using audit logs.

In CVE-2026-17527

EUVD-2026-49135 HIGH

Authorization Bypass Through User-Controlled Key (CWE-639)

2026-07-27 secalert@redhat.com

GHSA-2cmm-29f6-xcpx

Authentication Bypass

7.7

CVSS 3.1 · Vendor: redhat

Severity by source

Vendor (redhat) PRIMARY

7.7 HIGH

AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Red Hat

7.7 HIGH

qualitative

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

None

Availability

None

Lifecycle Timeline

Analysis Generated

Jul 27, 2026 - 10:31 vuln.today

CVE Published

Jul 27, 2026 - 10:16 nvd

HIGH 7.7

DescriptionCVE.org

In containerized-data-importer (CDI), the aggregated cdi.kubevirt.io:view ClusterRole, intended to provide read-only access to CDI resources, includes a rule granting create on the datavolumes/source subresource. CDI's DataVolume clone authorization accepts this permission as sufficient to authorize cloning the contents of any PVC the caller can name, without requiring write access to the source namespace. A user or service account bound to the view role, commonly granted cluster-wide via ClusterRoleBinding, who also has ordinary write access (edit/admin) to any single namespace, can use this to exfiltrate the contents of any PVC in the cluster into a namespace they control, bypassing namespace isolation and the read-only guarantee of the view role.

AnalysisAI

Privilege separation flaw in containerized-data-importer's view ClusterRole allows authenticated users with cluster-wide view permissions and write access to any namespace to clone and exfiltrate PersistentVolumeClaim (PVC) contents into a controlled namespace, bypassing namespace isolation and read-only guarantees. The vulnerability permits data theft across the cluster without requiring direct access to source namespaces.