CVE-2026-42457
vCluster Platform: Stored XSS can lead to privilege escalation
CVSS Score
9.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-79 |
| Vendor | loft-sh |
| Product | loft |
| Published | May 14, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
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