CVE-2026-86271: FluentCMS PermissionManager.cs GetAccessible authorization

Severity: medium (CVSS 4.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-07 · updated 2026-09-09
Weakness: CWE-862

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.

Affected products

FluentCMS: 0.0.1, 0.0.2, 0.0.3, 0.0.4, 0.0.5

References

https://github.com/fluentcms/FluentCMS/
https://github.com/fluentcms/FluentCMS/issues/2409
https://vuldb.com/cve/CVE-2026-86271
https://vuldb.com/submit/904824
https://vuldb.com/vuln/399430
https://vuldb.com/vuln/399430/cti

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