CVE-2026-42457: Loft-Sh Loft

Critical severity, CVSS 9.0. EPSS: 0.5% chance of exploitation in the next 30 days.

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

• Loft-Sh Loft: before 4.4.3 (fixed in 4.4.3); from 4.5.0-alpha.0, before 4.5.5 (fixed in 4.5.5); from 4.6.0-alpha.1, before 4.6.2 (fixed in 4.6.2); from 4.7.0-alpha.0, before 4.7.1 (fixed in 4.7.1)

Published 2026-05-14. Last modified 2026-06-17.