by Kastro CVE-2026-42457
loft-sh loft — vCluster Platform: Stored XSS can lead to privilege escalation
Description · from the CVE record
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
ProductAffectedFixed inSource
loft< 4.4.3–CNA
loft>=4.5.0-alpha.0 , < 4.5.5–CNA
loft>= 4.6.0-alpha.1, < 4.6.2–CNA
loft>= 4.7.0-alpha.0, < 4.7.1–CNA
Scores by source
GitHub_M (CNA)9.0CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total