CVE-2026-93538

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

State: Published
Severity: 7.1 High
Published: Sep 28, 2026
Updated: Sep 28, 2026
Reserved: Sep 18, 2026

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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.

Scores

CVSS	Score	Vector	Source
3.1	7.1 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N	suse

Weaknesses

CWE-290 Authentication bypass by spoofing
CWE-639 Authorization bypass through User-Controlled key

Affected Products

Product	Versions
RancherSUSE	0.16.0 to before 0.16.1Affected 0.15.0 to before 0.15.6Affected 0.14.0 to before 0.14.10Affected 0.13.0 to before 0.13.15Affected 0.12.0 to before 0.12.19Affected

References

https://github.com/rancher/fleet/security/advisories/GHSA-h9p5-fp5h-qpqrvendor-advisory

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