CVE-2026-71208
MEDIUMKubeSphere: SSRF via Unvalidated Cluster CRD Connection Endpoint in Cluster Reconciliation
Title source: cnaDescription
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).
References (2)
Core 2
Core References
third-party-advisory
https://github.com/ashikmd7/kubeSphere/blob/main/SSRF%20via%20Cluster%20CRD%20KubeConfig/README.md
third-party-advisory
https://github.com/kubesphere/kubesphere
Scores
CVSS v3
6.5
EPSS
0.0021
EPSS Percentile
11.2%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-918
Status
published
Products (1)
kubesphere/KubeSphere
4.0.0 - 4.1.3-rc.0
Published
Aug 05, 2026
Tracked Since
Aug 05, 2026