---
id: CVE-2026-88810
title: >-
  Privilege escalation in downstream clusters via GlobalRole
  inheritedNamespacedRules
summary: >-
  A privilege escalation issue was discovered in Rancher Manager's role-based
  access control. The inheritedNamespacedRules field of a GlobalRole propagates
  permissions into named namespaces of every downstream cluster managed by the
  Ranche…
severity: high
cvss: 7.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-306
vendor: SUSE
product: Rancher
affected:
  - Rancher >= 2.15.2 < 2.15.3
  - Webhook >= 0.11.0 < 0.11.4
  - Webhook >= 0.12.0 < 0.12.1
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-11-02T00:00:00+00:00'
published: '2026-11-02'
updated: '2026-11-03'
sourceUpdated: '2026-11-03T04:55:51.859Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-88810'
references:
  - url: 'https://github.com/rancher/webhook/security/advisories/GHSA-f898-2c8h-r7jc'
tags:
  - cve.org
epss: 0.00476
epssPercentile: 0.41251
ingestedAt: '2026-11-05T19:30:42.907Z'
---

## Overview

A privilege escalation issue was discovered in Rancher Manager's role-based access control. The inheritedNamespacedRules field of a GlobalRole propagates permissions into named namespaces of every downstream cluster managed by the Rancher instance, but it was not subject to the privilege-escalation validation applied to the other permission-carrying fields of a GlobalRole. As a result, a non-administrative user could be granted, through a global role  binding, permissions in downstream clusters that exceed the permissions that user already holds. This affected SUSE Rancher 2.15.2 only, and SUSE Rancher Webhook 0.11.0 up to 0.11.4, and 0.12.0 up to 0.12.1.

## Affected

- `Rancher >= 2.15.2 < 2.15.3`
- `Webhook >= 0.11.0 < 0.11.4`
- `Webhook >= 0.12.0 < 0.12.1`

## Remediation

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