---
id: CVE-2026-86271
title: A vulnerability was found in FluentCMS up to 0.0.5
summary: >-
  A vulnerability was found in FluentCMS up to 0.0.5. This affects the function
  GetAccessible of the file
  src/Backend/FluentCMS.Services/Permissions/PermissionManager.cs. Performing a
  manipulation results in missing authorization. It is po…
severity: medium
cvss: 4.7
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L'
cwe:
  - CWE-862
  - CWE-863
product: FluentCMS
affected:
  - FluentCMS 0.0.1
  - FluentCMS 0.0.2
  - FluentCMS 0.0.3
  - FluentCMS 0.0.4
  - FluentCMS 0.0.5
published: '2026-09-07'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T15:17:15.700'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-86271'
references:
  - url: 'https://github.com/fluentcms/FluentCMS/'
    label: cna@vuldb.com
  - url: 'https://github.com/fluentcms/FluentCMS/issues/2409'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/cve/CVE-2026-86271'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/submit/904824'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/399430'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/399430/cti'
    label: cna@vuldb.com
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-09T14:14:35.198073Z'
epss: 0.00232
epssPercentile: 0.14298
ingestedAt: '2026-09-08T15:33:26.975Z'
---

## Overview

A vulnerability was found in FluentCMS up to 0.0.5. This affects the function GetAccessible of the file src/Backend/FluentCMS.Services/Permissions/PermissionManager.cs. Performing a manipulation results in missing authorization. It is possible to initiate the attack remotely. The exploit has been made public and could be used. The project was informed of the problem early through an issue report but has not responded yet.

## Remediation

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