CVE-2021-25320
CRITICAL9.9EPSS 0.20%Rancher cloud credentials can be used through proxy API by users without access
Published: 3/3/2026Modified: 3/23/2026
Description
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.
Affected packages (2)
- Go/github.com/rancher/rancher>= 2.2.0, < 2.4.16
- Go/github.com/rancher/rancher>= 2.2.0+incompatible
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.9 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |