Auth bypass in SUSE Rancher
CVE-2026-93538
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/rancher/fleet/security/advisories/GHSA-h9p5-fp5h-qpqr (vendor-advisory)
Frequently asked questions
- What is CVE-2026-93538?
- CVE-2026-93538 is a high-severity vulnerability in SUSE Rancher, classified under Authentication Bypass by Spoofing. CVSS score: 7.1/10. Published 2026-09-28.
- How severe is CVE-2026-93538?
- High severity. CVSS v3 base score is 7.1 out of 10.