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Critical · 9.0 CVE-2026-42457 EUVD-2026-30301

vCluster Platform: Stored XSS can lead to privilege escalation

Published May 14, 2026 · Updated May 14, 2026 · Assigned by GitHub_M

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

VendorProductAffectedFixed
loft-sh loft < 4.4.3, >=4.5.0-alpha.0 , < 4.5.5, >= 4.6.0-alpha.1, < 4.6.2, >= 4.7.0-alpha.0, < 4.7.1 —

References