CVE-2026-25705
HighSummary
A vulnerability has been identified in Rancher's Extensions that allows malicious code injection through a path traversal in the `compressedEndpoint` field inside a `UIPlugin` deployment. A malicious UI extension could exploit this to overwrite Rancher binaries or configuration.
Risk Assessment
The organization may face serious threats such as tampering with cluster state and the potential for malicious code injection into the system. The potential chaining of this vulnerability with other attack vectors increases the risk.
Recommendation
It is recommended to update to the latest version of Rancher and review and secure UI extension deployments to minimize the risk associated with this vulnerability.
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Original NVD description (English source)
A vulnerability has been identified in [Rancher's Extensions](https://ranchermanager.docs.rancher.com/integrations-in-rancher/rancher-extensions) where malicious code can be injected in Rancher through a path traversal in the `compressedEndpoint` field inside a `UIPlugin` deployment. A malicious UI extension could abuse that to: * Overwrite Rancher binaries or configuration to inject code. * Write to /var/lib/rancher/ to tamper with cluster state. * If hostPath volumes are mounted, write to the host node filesystem. * Use this issue to chain with other attack vectors.