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CVE-2026-42457— vCluster Platform: Stored XSS can lead to privilege escalation

CVSS 9.0 · Critical EPSS 0.05% · P14

Affected Version Matrix 4

VendorProductVersion RangeStatus
loft-shloft< 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
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I. Basic Information for CVE-2026-42457

Vulnerability Information
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Vulnerability Title
vCluster Platform: Stored XSS can lead to privilege escalation
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: NVD (National Vulnerability Database)
Vulnerability Title
vCluster Platform 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
vCluster Platform是vCluster开源的一个虚拟集群管理器。 vCluster Platform 4.4.3之前版本、4.5.5之前版本、4.6.2之前版本、4.7.1之前版本和4.8.0之前版本存在跨站脚本漏洞，该漏洞源于templateRef的name字段存在存储型跨站脚本，可能导致在平台浏览器环境中执行任意外部脚本，恶意用户可能创建新的全局管理员用户绕过其他安全限制。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
loft-shloft < 4.4.3 -

II. Public POCs for CVE-2026-42457

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III. Intelligence Information for CVE-2026-42457

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IV. Related Vulnerabilities

Same product: loft
Same vendor: loft-sh
Same weakness: CWE-79

V. Comments for CVE-2026-42457

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