CVE-2026-93538: Cross-tenant BundleDeployment and Secret disclosure via spoofed cluster labels during agent-initiated registration in Fleet
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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
SUSE Rancher Fleetto a version that resolves this vulnerability.Fixed in 0.16.1 - Upgrade
Upgrade
SUSE Rancher Fleetto a version that resolves this vulnerability.Fixed in 0.15.6 - Upgrade
Upgrade
SUSE Rancher Fleetto a version that resolves this vulnerability.Fixed in 0.14.10 - Upgrade
Upgrade
SUSE Rancher Fleetto a version that resolves this vulnerability.Fixed in 0.13.15 - Upgrade
Upgrade
SUSE Rancher Fleetto a version that resolves this vulnerability.Fixed in 0.12.19
Event History
Frequently Asked Questions
Which environments are exposed to cross-tenant impact?
The issue applies where multiple tenants can register clusters into the same Fleet workspace namespace. A tenant's cluster can then match GitRepo or Bundle targeting rules intended for another cluster.
What access does an attacker need?
An attacker needs the ability to register a cluster into a Fleet workspace namespace shared with other tenants. They can supply cluster labels during agent-initiated registration, including labels in the reserved management.cattle.io/ namespace.
Which Fleet releases contain fixes?
Fixed releases are Fleet 0.16.1, 0.15.6, 0.14.10, 0.13.15, and 0.12.19. Versions earlier than those patch levels, including older versions, are affected.