CVE-2026-42457 CRITICAL

CVE-2026-42457: vCluster Platform: Stored XSS can lead to privilege escalation

Vendor Loft-Sh
Product loft
Weakness CWE-79 · XSS
Published May 14, 2026
Last update May 14, 2026

CVSS base score

9.0/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction Required
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

What the vulnerability does

01Description

vCluster Platform provides a Kubernetes platform for managing virtual clusters, multi-tenancy, and cluster sharing. Prior to 4.4.3, 4.5.5, 4.6.2, 4.7.1, and 4.8.0, there is a Stored XSS attack vulnerability via the name field of a templateRef. This can lead to the execution of arbitrary external scripts within the platform's browser context. In the worst case, a malicious user could potentially create a new Global-Admin user, bypassing other security restrictions. The attacker needs the ability to create namespaces. This vulnerability is fixed in 4.4.3, 4.5.5, 4.6.2, 4.7.1, and 4.8.0.

Key dates

02Disclosure timeline

May 14, 2026 CVE published
May 14, 2026 Record updated

Related vulnerabilities

04Related CVE