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CVE PROGRAM SOURCE RECORD9.0 Critical

CVE-2026-42457

vCluster Platform: Stored XSS can lead to privilege escalation

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

loft-sh loft

  • < 4.4.3affected
  • >=4.5.0-alpha.0 , < 4.5.5affected
  • >= 4.6.0-alpha.1, < 4.6.2affected
  • >= 4.7.0-alpha.0, < 4.7.1affected

References