CVE-2026-86271 FluentCMS PermissionManager.cs GetAccessible authorization
Attackers can bypass authorization checks in FluentCMS to access or modify data without proper permissions.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-86271?
CVE-2026-86271 is a medium-severity missing authorization vulnerability in FluentCMS, published on 7 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-86271?
How do I fix CVE-2026-86271?
No fix has been published for CVE-2026-86271 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-86271 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-86271 exists.
Sources
Also known as GHSA-pj96-33w4-9mgg.