CVE-2026-71208
KubeSphere - SSRF via Unvalidated Cluster CRD Connection Endpoint in Cluster Reconciliation
- State
- Published
- Severity
- 6.5 Medium
- Published
- Aug 5, 2026
- Updated
- Aug 12, 2026
- Reserved
- Aug 5, 2026
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).
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 6.5 Medium | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N | TuranSec |
Weaknesses
- CWE-918 Server-Side Request Forgery (SSRF)
Affected Products
| Product | Versions |
|---|---|
KubeSpherekubesphere |
|
References
- https://github.com/ashikmd7/kubeSphere/blob/main/SSRF%20via%20Cluster%20CRD%20KubeConfig/README.mdthird-party-advisory
- https://github.com/kubesphere/kubespherethird-party-advisory
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