---
id: CVE-2026-84715
title: >-
  FeatherPanel versions before 1.3.7.10 fail to validate permissions in the
  SubuserController updateSubuser handler, allowing authenticated subusers to
  modify their own permission records
summary: >-
  FeatherPanel versions before 1.3.7.10 fail to validate permissions in the
  SubuserController updateSubuser handler, allowing authenticated subusers to
  modify their own permission records. A subuser with minimal permissions can
  send a craf…
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-862
published: '2026-09-02'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T15:53:23.707'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-84715'
references:
  - url: 'https://github.com/MythicalLTD/FeatherPanel'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/MythicalLTD/FeatherPanel/blob/376b003aa9685b74153d239d2b3f64a752cdc0f0/backend/app/Controllers/User/Server/SubuserController.php#L454
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/MythicalLTD/FeatherPanel/blob/376b003aa9685b74153d239d2b3f64a752cdc0f0/backend/app/Helpers/ServerGateway.php
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/MythicalLTD/FeatherPanel/commit/06ef8dcac471201748516ca743694159cb846a9d
    label: disclosure@vulncheck.com
  - url: 'https://github.com/MythicalLTD/FeatherPanel/releases/tag/v1.3.7.10'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/featherpanel-before-1.3.7.10-privilege-escalation-via-subuser-permission-update
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
epss: 0.00564
epssPercentile: 0.44558
ingestedAt: '2026-09-10T16:57:28.701Z'
vendor: MythicalLTD
product: FeatherPanel
affected:
  - FeatherPanel < 1.3.7.10
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-02T13:43:14.950648Z'
---

## Overview

FeatherPanel versions before 1.3.7.10 fail to validate permissions in the SubuserController updateSubuser handler, allowing authenticated subusers to modify their own permission records. A subuser with minimal permissions can send a crafted request to grant themselves full server control, enabling unauthorized access to sensitive data, backups, and server configuration.

## Remediation

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