CVE-2026-88808 — Fleet agent copies downstream resources with cluster-admin privileges, allowing cross-namespace writes on downstream clusters
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 Se…
Published: 2026-09-28 · CVSS: 8.8 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7