Improper Authorization in FluentCMS Affects Remote Security
CVE-2026-86271

5.1MEDIUM

Key Information:

Vendor

FluentCMS

Status
Fluentcms
Vendor
CVE Published:
7 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-86271?

A security vulnerability was identified in FluentCMS versions up to 0.0.5, specifically within the GetAccessible function located in the PermissionManager.cs file. This flaw results in inadequate authorization checks, allowing unauthorized access when exploited. The vulnerability is particularly concerning as it can be triggered remotely, posing a significant risk to users. Despite being reported to the developers, there has been no official response or patch released to address the issue, putting systems at potential risk.

Affected Version(s)

FluentCMS 0.0.1

FluentCMS 0.0.2

FluentCMS 0.0.3

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-86271 - Proof of Concept

References

https://vuldb.com/vuln/399430
vdb-entrytechnical-description
https://vuldb.com/vuln/399430/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-86271
third-party-advisory

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

volksec (VulDB User)
VulDB CNA Team
.