BaserProject BaserCMS up to 5.3.1/5.4.1 Permission Groups Service config/permission.php build privileges management

Summaryinfo

A vulnerability was found in BaserProject BaserCMS up to 5.3.1/5.4.1 and classified as problematic. The affected element is the function PermissionGroupsService::build of the file config/permission.php of the component Permission Groups Service. Executing a manipulation can lead to privileges management. This vulnerability is handled as CVE-2026-115481. The attack can be executed remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in BaserProject BaserCMS up to 5.3.1/5.4.1. This vulnerability affects the function PermissionGroupsService::build of the file config/permission.php of the component Permission Groups Service. The manipulation with an unknown input leads to a privileges management vulnerability. The CWE definition for the vulnerability is CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

baserCMS is a website development framework. Starting in version 5.0.0-beta1 and prior to versions 5.3.2 and 5.4.2, `PermissionGroupsService::build()` reads a plugin's `config/permission.php` to decide what each user group may reach. When that file is absent it writes a wildcard allow rule instead: `url` `/baser/<prefix>/<plugin>/*`, `method` `*`, `auth` true, for every non-admin group. BcCustomContent has no such file in any release. After an administrator installs it, the default `operators` group can store and execute arbitrary PHP under the document root. Versions 5.3.2 and 5.4.2 patch the issue.

The advisory is available at github.com. This vulnerability was named CVE-2026-115481 since 10/22/2026. The exploitation appears to be easy. The attack can be initiated remotely. The exploitation needs additional levels of successful authentication. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

By approaching the search of inurl:config/permission.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 5.3.2 or 5.4.2 eliminates this vulnerability.

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Productinfo

Type

• Content Management System

Vendor

• BaserProject

Name

• BaserCMS

Version

• 5.3.0
• 5.3.1
• 5.4.0
• 5.4.1

License

• open-source

Website

• Product: https://github.com/baserproject/basercms/

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