CVE-2026-88808GHSA-q9v4-358v-r8q5
Rancher: Fleet agent copies downstream resources with cluster-admin privileges, allowing cross-namespace writes on downstream clusters
SUSE RancherApplications & CMS
CVSS
8.8HighExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.28%Chance of exploitation activity in the next 30 days, higher than 19% of CVEs. Scored 23 Oct 2026FIRST EPSS
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 vulnerability has been identified within Rancher Manager where the Fleet agent wrote resources to downstream clusters using its own cluster-admin credentials instead of the ServiceAccount pinned to the deployment. It affects multi-tenancy environments where different tenants share the same downstream clusters, for example different privileged or untrusted teams inside the same organization. This could lead to overwritten configuration files.
This issue affected SUSE Rancher Fleet 0.16 before 0.16.2, 0.15 before 0.15.7, and 0.14 before 0.14.11.
Text from CVE List
Affected versions 3
- Rancheraffected: 0.16.0 before 0.16.2CVE List
- Rancheraffected: 0.15.0 before 0.15.7CVE List
- Rancheraffected: 0.14.0 before 0.14.11CVE List