All vulnerabilities
CVE-2026-93538GHSA-h9p5-fp5h-qpqr

Rancher: Cross-tenant BundleDeployment and Secret disclosure via spoofed cluster labels during agent-initiated registration in Fleet

SUSE RancherApplications & CMS
Open in ThreatlineRecord JSON
CVSS
7.1High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.17%Chance of exploitation activity in the next 30 days, higher than 6% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in0.16.1Also 0.15.6, 0.14.10 and 2 moreCVE List
Published28 Sep 2026Updated 28 Sep 2026CVE List

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

A cross-tenant authorization issue was discovered in SUSE Rancher Fleet. During agent-initiated cluster registration, cluster labels supplied by the registering agent, including labels in the reserved management.cattle.io/ namespace such as the cluster display name label, were applied to the resulting upstream Cluster object. Because Fleet resolves GitRepo and Bundle targets from those cluster labels, a party able to register a cluster into a Fleet workspace namespace shared with other tenants could cause its own cluster to satisfy targeting rules that administrators intended for a different cluster. This affects SUSE Rancher Fleet 0.16 before 0.16.1, 0.15 before 0.15.6, 0.14 before 0.14.10, 0.13 before 0.13.15, 0.12 before 0.12.19 and older versions.

Text from GitHub Advisory Database

Affected versions 10

  • Rancheraffected: 0.16.0 before 0.16.1CVE List
  • Rancheraffected: 0.15.0 before 0.15.6CVE List
  • Rancheraffected: 0.14.0 before 0.14.10CVE List
  • Rancheraffected: 0.13.0 before 0.13.15CVE List
  • Rancheraffected: 0.12.0 before 0.12.19CVE List
  • github.com/rancher/fleet, go>=v0.16.0, <v0.16.1GitHub
  • github.com/rancher/fleet, go>=v0.15.0, <v0.15.6GitHub
  • github.com/rancher/fleet, go>=v0.14.0, <v0.14.10GitHub
  • github.com/rancher/fleet, go>=v0.13.0, <v0.13.15GitHub
  • github.com/rancher/fleet, go>=v0.12.0, <v0.12.19GitHub

References 1