CVE-2026-55997
HIGH
NVD
CVSS Score
8.8
Severity
HIGH
Published
Aug 05, 2026
Vendor
unknown
Description
Rancher issues long-lived registration tokens to authenticate nodes and agents joining a downstream cluster. These tokens were stored and exposed in plaintext with no expiration, so a malicious user could obtain one either through the Rancher API, etcd, stored automation, or direct file access on a node, and could use it at any time to register a rogue node into the cluster.