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CVE-2026-71208— KubeSphere - SSRF via Unvalidated Cluster CRD Connection Endpoint in Cluster Reconciliation

Quick assessment

Affected
kubesphere KubeSphere
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

KubeSphere是KubeSphere基金会开源的一个云原生管理平台。 KubeSphere 4.0.0版本至4.1.3-rc.0版本存在服务端请求伪造漏洞，该漏洞源于cluster-controller reconciliation（pkg/utils/clusterclient/clusterclient.go，addCluster）在处理Cluster自定义资源的连接配置时，对CRD指定的Kubernetes API端点仅进行URL语法解析，未限制回环地址、私有地址、链路本地地址或云元数据地址，

CVSS 6.5 · Medium EPSS 0.21% · P11

Affected Version Matrix 1

VendorProduct Version RangeStatus
kubesphere KubeSphere 4.0.0≤ 4.1.3-rc.0 affected
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I. Basic Information for CVE-2026-71208

Vulnerability Information
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Vulnerability Title
KubeSphere - SSRF via Unvalidated Cluster CRD Connection Endpoint in Cluster Reconciliation
Source: CVE Program / CVE List V5
Vulnerability Description
KubeSphere's cluster-controller reconciliation (pkg/utils/clusterclient/clusterclient.go, addCluster) processes every Cluster custom resource's connection configuration and immediately calls Discovery.ServerVersion against the CRD-specified Kubernetes API endpoint, which is parsed only for URL syntax (url.Parse) with no allow/deny-list for loopback, RFC1918 private ranges, link-local, or cloud-metadata addresses (e.g. 169.254.169.254).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
KubeSphere 服务端请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
KubeSphere是KubeSphere基金会开源的一个云原生管理平台。 KubeSphere 4.0.0版本至4.1.3-rc.0版本存在服务端请求伪造漏洞，该漏洞源于cluster-controller reconciliation（pkg/utils/clusterclient/clusterclient.go，addCluster）在处理Cluster自定义资源的连接配置时，对CRD指定的Kubernetes API端点仅进行URL语法解析，未限制回环地址、私有地址、链路本地地址或云元数据地址，
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

Vendor Product Affected Versions CPE Subscribe
kubesphere KubeSphere 4.0.0 ~ 4.1.3-rc.0 -

II. Public POCs for CVE-2026-71208

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III. Intelligence Information for CVE-2026-71208

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Other References for CVE-2026-71208 (1)

IV. Related Vulnerabilities

Same product: KubeSphere
Same vendor: kubesphere
Same weakness: CWE-918

V. Comments for CVE-2026-71208

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