---
id: CVE-2026-115481
title: >-
  baserCMS: BcCustomContent file fields can be configured to allow executable
  file extensions such as php, leading to arbitrary PHP file upload
summary: >-
  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. Whe…
severity: high
cvss: 8.5
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'
cvssSource: cna
cwe:
  - CWE-434
vendor: baserproject
product: basercms
affected:
  - 'basercms >= 5.0.0-beta1, < 5.3.2'
  - 'basercms >= 5.4.0, < 5.4.2'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-23T14:54:26.499088Z'
published: '2026-10-23'
updated: '2026-10-23'
sourceUpdated: '2026-10-23T14:58:03.802Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-115481'
references:
  - url: >-
      https://github.com/baserproject/basercms/security/advisories/GHSA-8jrp-4h7c-m679
    label: >-
      https://github.com/baserproject/basercms/security/advisories/GHSA-8jrp-4h7c-m679
  - url: >-
      https://github.com/baserproject/basercms/commit/2ed19c878add5c26fc765572e0e77173c1f1fdb5
    label: >-
      https://github.com/baserproject/basercms/commit/2ed19c878add5c26fc765572e0e77173c1f1fdb5
  - url: >-
      https://github.com/baserproject/basercms/commit/b0ef31b10dc6267b48ebc9a80d34bc7c4c09c311
    label: >-
      https://github.com/baserproject/basercms/commit/b0ef31b10dc6267b48ebc9a80d34bc7c4c09c311
  - url: 'https://github.com/baserproject/basercms/releases/tag/5.3.2'
    label: 'https://github.com/baserproject/basercms/releases/tag/5.3.2'
  - url: 'https://github.com/baserproject/basercms/releases/tag/5.4.2'
    label: 'https://github.com/baserproject/basercms/releases/tag/5.4.2'
tags:
  - cve.org
ingestedAt: '2026-10-23T14:28:08.706Z'
---

## Overview

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.

## Affected

- `basercms >= 5.0.0-beta1, < 5.3.2`
- `basercms >= 5.4.0, < 5.4.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.