Fleet agent copies downstream resources with cluster-admin privileges, allowing cross-namespace writes on downstream clusters

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-88808
StatePUBLISHED
Assignersuse
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-28 16:17:16 UTC
Updated2026-09-29 21:32:59 UTC
DescriptionA vulnerability has been identified within Rancher Manager where the Fleet agent wrote resources to downstream clusters using its own cluster-admin credentials instead of the ServiceAccount pinned to the deployment. It affects multi-tenancy environments where different tenants share the same downstream clusters, for example different privileged or untrusted teams inside the same organization. This could lead to overwritten configuration files. This issue affected SUSE Rancher Fleet 0.16 before 0.16.2, 0.15 before 0.15.7, and 0.14 before 0.14.11.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from [email protected]

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

EPSS: 0.002720000 probability, percentile 0.175980000 (date 2026-09-29)

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

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNACVSS8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA SUSE Rancher affected 0.16.0 0.16.2 semver Not specified
CNA SUSE Rancher affected 0.15.0 0.15.7 semver Not specified
CNA SUSE Rancher affected 0.14.0 0.14.11 semver Not specified

References

ReferenceSourceLinkTags
github.com/rancher/fleet/security/advisories/GHSA-q9v4-358v-r8q5 [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: [email protected] (en)

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