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High severity · published Sep 28, 2026
CVE-2026-93538
Cross-tenant BundleDeployment and Secret disclosure via spoofed cluster labels during agent-initiated registration in Fleet
7.1
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 6% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RA
Rancher · SUSE
0.16.0 before 0.16.1; 0.15.0 before 0.15.6; 0.14.0 before 0.14.10; 0.13.0 before 0.13.15; 0.12.0 before 0.12.19 · source: vendor
RF
Rancher Fleet · Suse
0.12.0 before 0.12.19; 0.13.0 before 0.13.15; 0.14.0 before 0.14.10; 0.15.0 before 0.15.6; 0.16.0 before 0.16.1 · source: NVD
Affected product
RA
Rancher
SUSE
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-93538
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-93538
vendor-advisory
https://github.com/rancher/fleet/security/advisories/GHSA-h9p5-fp5h-qpqr
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