CVE-2026-71208 KubeSphere - SSRF via Unvalidated Cluster CRD Connection Endpoint in Cluster Reconciliation
Attackers can exploit unvalidated cluster endpoints in KubeSphere to perform Server-Side Request Forgery, potentially accessing internal metadata or private networks.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-71208?
CVE-2026-71208 is a medium-severity server-side request forgery vulnerability in KubeSphere, published on 5 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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).
Weakness: CWE-918
Which versions are affected by CVE-2026-71208?
How do I fix CVE-2026-71208?
No fix has been published for CVE-2026-71208 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-71208 being exploited?
There is no known exploitation of CVE-2026-71208 in the wild and no public exploit code.
Sources
Also known as GHSA-w56j-p32j-vmh4.