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Open-source package vulnerability · Go

CVE-2021-25320: Rancher cloud credentials can be used through proxy API by users without access

criticalCVSS 3.1 9.9GHSA-gqf8-rvrh-g7w6

A vulnerability was discovered in Rancher 2.2.0 through the aforementioned patched versions, where cloud credentials weren't being properly validated through the Rancher API. Specifically through a proxy designed to communicate with cloud providers.

Published Mar 3, 2026

Affected packages

github.com/rancher/rancher

Ecosystem
Go
Affected
>= 2.2.0, < 2.4.16
Fixed in
2.4.16
Check
go list -m github.com/rancher/rancher

github.com/rancher/rancher

Ecosystem
Go
Affected
>= 2.5.0, < 2.5.9
Fixed in
2.5.9
Check
go list -m github.com/rancher/rancher

Advisory details

From the GitHub Advisory Database (CC BY 4.0).

A vulnerability was discovered in Rancher 2.2.0 through the aforementioned patched versions, where cloud credentials weren't being properly validated through the Rancher API. Specifically through a proxy designed to communicate with cloud providers. Any Rancher user that was logged-in and aware of a cloud-credential ID that was valid for a given cloud provider, could call that cloud provider's API through the proxy API, and the cloud-credential would be attached. The exploit is limited to valid Rancher users. There is not a direct mitigation outside of upgrading to the patched Rancher versions.

References

How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology

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