Privilege escalation to cluster-admin on the Rancher local cluster through Fleet's agent management controller

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-94290
StatePUBLISHED
Assignersuse
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-02 16:17:45 UTC
Updated2026-11-03 05:18:55 UTC
DescriptionSUSE Rancher Fleet clusters reference a kubeconfig secret that the controller uses to install and manage a Fleet agent on the target cluster. The controller did not sufficiently restrict which kubeconfig secrets a Fleet Cluster object was allowed to reference. As a result, a Fleet cluster defined in a namespace an ordinary user controls could be associated with administrative credentials for the management cluster itself, causing the controller to manage the management cluster on that user's behalf and to run that user's Fleet content there with elevated privileges. This affects SUSE Rancher Fleet 0.16.0 up to 0.16.3, 0.15.0 up to 0.15.8, 0.14.0 up to 0.14.12, 0.13.0 up to 0.13.17 and possible older versions.

Risk And Classification

Primary CVSS: v3.1 9.1 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

EPSS: 0.004990000 probability, percentile 0.428540000 (date 2026-11-03)

Problem Types: CWE-250 | CWE-250 CWE-250 Execution with unnecessary privileges

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
3.1CNACVSS9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA SUSE Rancher affected 0.16.0 0.16.3 semver Not specified
CNA SUSE Rancher affected 0.15.0 0.15.8 semver Not specified
CNA SUSE Rancher affected 0.14.0 0.14.12 semver Not specified
CNA SUSE Rancher affected 0.13.0 0.13.17 semver Not specified

References

ReferenceSourceLinkTags
github.com/rancher/fleet/security/advisories/GHSA-qfmw-gw96-ffcr [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Kenzie Cuttler (en)

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