CVE-2026-42457CWE-79

vCluster Platform: Stored XSS can lead to privilege escalation

Critical · published May 14, 2026

CVSS v3.1
9.0
EPSS
1%
Percentile
44.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.0 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00541 · 44.7th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-05-14T14:48Z
EPSS history
Timeline
  • 14 MAY 14:48Z
    vCluster Platform: Stored XSS can lead to privilege escalation
    cvelistv5