CVE-2026-86271
Received Received - Intake

FluentCMS Missing Authorization in PermissionManager

Publication date: 2026-09-07

Last updated on: 2026-09-07

Assigner: VulDB

Description
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.

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Meta Information

Published
2026-09-07
Last Modified
2026-09-07
Generated
2026-09-07
AI Q&A
2026-09-07
EPSS Evaluated
N/A
NVD
CVE-2026-86271
EUVD
EUVD-2026-72253

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
fluentcms fluentcms to 0.0.5 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-863 The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.
CWE-862 The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

Attack-Flow Graph

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Executive Summary

This vulnerability is a missing authorization flaw in FluentCMS up to version 0.0.5. It allows authenticated users with restricted access to bypass permissions and access resources belonging to other sites or tenants. The issue stems from improper caching of authorization data and lack of verification when accessing files or folders by UUID.

Impact Analysis

An attacker with administrative access to one site could read, modify, or delete files and data belonging to other sites in a multi-site deployment. This could lead to data breaches, unauthorized content changes, or service disruption across multiple tenants.

Compliance Impact

This vulnerability could violate compliance requirements for data isolation and access controls. It may lead to unauthorized access to sensitive data, breaching GDPR's data protection principles or HIPAA's access control requirements for protected health information.

Mitigation Strategies

Immediately restrict administrator access to specific sites only and avoid cross-site operations. Review File/Folder UUID access logs for unauthorized site B access attempts. Implement per-site authorization checks in PermissionManager and File/Folder services as suggested in the issue report.

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