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5.3 Medium

CVE-2026-55998 The endpoint /v3/import/{token}_{clusterId}.yaml retrieves the cluster object before validating the token

Description

The endpoint /v3/import/{token}_{clusterId}.yaml retrieves the cluster object before validating the token. When a valid cluster ID references a cluster that has private registry secrets configured, a nil pointer dereference in pkg/systemtemplate/private_registry.go causes the request to return HTTP 502 Bad Gateway. For cluster IDs that do not exist, the endpoint returns HTTP 200. This observable difference in response codes constitutes a reliable enumeration oracle.

Affected products and versions

Product Affected versions Fixed in
Rancher 2.14 2.14.0 → < 2.14.4 2.14.4
Rancher 2.13 2.13.0 → < 2.13.8 2.13.8
Rancher 2.12 2.12.0 → < 2.12.12 2.12.12
Rancher 2.11 2.11.0 → < 2.11.16 2.11.16

References

Timeline

  1. Published
  2. Last modified

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