CVE-2026-88808: Suse Rancher Fleet

High severity, CVSS 8.8. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Suse Rancher Fleet: from 0.14.0, before 0.14.11 (fixed in 0.14.11); from 0.15.0, before 0.15.7 (fixed in 0.15.7); from 0.16.0, before 0.16.2 (fixed in 0.16.2)

Published 2026-09-28. Last modified 2026-10-07.