CVE-2026-17107: Unintended Proxy or Intermediary

A flaw was found in the cluster-proxy service-proxy component used in Red Hat Advanced Cluster Management for Kubernetes RHACM and multicluster-engine MCE. The service-proxy appends impersonation group headers to proxied requests without first removing caller-supplied values, and the spoke...

Privilege Escalation

github.com/rancher/rancher/ is vulnerable to Privilege Escalation. The vulnerability is due to the handling of "Impersonate-User" or "Impersonate-Group" headers, allowing malicious users to access unauthorized information...

GHSA-PVXJ-25M6-7VQR Rancher Privilege escalation vulnerability via malicious "Connection" header

A vulnerability was discovered in Rancher 2.0.0 through the aforementioned patched versions, where a malicious Rancher user could craft an API request directed at the proxy for the Kubernetes API of a managed cluster to gain access to information they do not have access to. This is done by passin...

SUSE CVE-2021-31999

A Reliance on Untrusted Inputs in a Security Decision vulnerability in Rancher allows users in the cluster to act as others users in the cluster by forging the "Impersonate-User" or "Impersonate-Group" headers. This issue affects: Rancher versions prior to 2.5.9. Rancher versions prior to 2.4.16...

Rancher Labs Rancher has an unspecified vulnerability

Rancher Labs Rancher is an open source, enterprise-class container management platform from Rancher Labs, Inc. A security vulnerability exists in Rancher Labs Rancher, which stems from a reliance on untrusted input in a security decision vulnerability in Rancher. An attacker could exploit the...

CVE-2021-31999

A Reliance on Untrusted Inputs in a Security Decision vulnerability in Rancher allows users in the cluster to act as others users in the cluster by forging the "Impersonate-User" or "Impersonate-Group" headers. This issue affects: Rancher versions prior to 2.5.9. Rancher versions prior to 2.4.16...

CVE-2021-31999 Rancher: Privilege escalation vulnerability via malicious Connection header

A Reliance on Untrusted Inputs in a Security Decision vulnerability in Rancher allows users in the cluster to act as others users in the cluster by forging the "Impersonate-User" or "Impersonate-Group" headers. This issue affects: Rancher versions prior to 2.5.9. Rancher versions prior to 2.4.16...

PT-2021-3743

Name of the Vulnerable Software and Affected Versions Rancher versions prior to 2.5.9 Rancher versions prior to 2.4.16 Description A vulnerability in Rancher allows users in the cluster to act as other users by forging the Impersonate-User or Impersonate-Group headers. This issue is related to...

CVE-2021-31999: Reliance on Untrusted Inputs in a Security Decision

A Reliance on Untrusted Inputs in a Security Decision vulnerability in Rancher allows users in the cluster to act as others users in the cluster by forging the "Impersonate-User" or "Impersonate-Group" headers. This issue affects: Rancher versions prior to 2.5.9. Rancher versions prior to 2.4.16...