CVE-2026-94290
Privilege escalation to cluster-admin on the Rancher local cluster through Fleet's agent management controller
SUSE 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.
Fixes and workarounds
Fix
github.com/rancher/fleet (go): GitHub reports patched versions 0.16.3. Check the advisory for the affected release branch.
Source: GitHub GHSA-qfmw-gw96-ffcrFix
github.com/rancher/fleet (go): GitHub reports patched versions 0.15.8. Check the advisory for the affected release branch.
Source: GitHub GHSA-qfmw-gw96-ffcrFix
github.com/rancher/fleet (go): GitHub reports patched versions 0.14.12. Check the advisory for the affected release branch.
Source: GitHub GHSA-qfmw-gw96-ffcrFix
github.com/rancher/fleet (go): GitHub reports patched versions 0.13.17. Check the advisory for the affected release branch.
Source: GitHub GHSA-qfmw-gw96-ffcrAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| Rancher SUSE Fleet
|
≥ 0.16.0; < 0.16.3 (affected, semver) ≥ 0.15.0; < 0.15.8 (affected, semver) ≥ 0.14.0; < 0.14.12 (affected, semver) ≥ 0.13.0; < 0.13.17 (affected, semver) Other versions: unaffected |
CNA: suse |
github.com/rancher/fleetgithub.com/rancher/fleet
go |
>=0.16.0, <0.16.3 (affected, GitHub advisory range) | GitHub GHSA-qfmw-gw96-ffcr |
github.com/rancher/fleetgithub.com/rancher/fleet
go |
>=0.15.0, <0.15.8 (affected, GitHub advisory range) | GitHub GHSA-qfmw-gw96-ffcr |
github.com/rancher/fleetgithub.com/rancher/fleet
go |
>=0.14.0, <0.14.12 (affected, GitHub advisory range) | GitHub GHSA-qfmw-gw96-ffcr |
github.com/rancher/fleetgithub.com/rancher/fleet
go |
>=v0.13.0, <0.13.17 (affected, GitHub advisory range) | GitHub GHSA-qfmw-gw96-ffcr |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 9.1 critical |
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H | CNA: suse |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/rancher/fleet/security/advisories/GHSA-qfmw-gw96-ffcrCNA: suse · vendor-advisory
- https://github.com/rancher/fleet/security/advisories/GHSA-qfmw-gw96-ffcrGitHub Security Advisories · advisory
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