---
id: CVE-2026-88808
title: >-
  A 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
summary: >-
  A 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-tena…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-250
vendor: SUSE
product: Fleet
affected:
  - Fleet >= 0.16.0 < 0.16.2
  - Fleet >= 0.15.0 < 0.15.7
  - Fleet >= 0.14.0 < 0.14.11
published: '2026-09-28'
updated: '2026-09-28'
sourceUpdated: '2026-09-28T16:17:16.150'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-88808'
references:
  - url: 'https://github.com/rancher/fleet/security/advisories/GHSA-q9v4-358v-r8q5'
    label: meissner@suse.de
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-28T16:15:01.372Z'
---

## Overview

A 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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.