CVE-2026-30940baserCMS: Path Traversal in Theme File API Leads to Arbitrary File Write and RCE

Descripción

baserCMS is a website development framework. Prior to version 5.2.3, a path traversal vulnerability exists in the theme file management API (/baser/api/admin/bc-theme-file/theme_files/add.json) that allows arbitrary file write. An authenticated administrator can include ../ sequences in the path parameter to create a PHP file in an arbitrary directory outside the theme directory, which may result in remote code execution (RCE). This issue has been patched in version 5.2.3.

Datos: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Se publican tal como los indican las fuentes, en inglés.

Productos y versiones afectados

Referencias y parches

• https://github.com/baserproject/basercms/security/advisories/GHSA-c5c6-37vq-pjcq ExploitVendor Advisory
• https://basercms.net/security/JVN_20837860 Vendor Advisory
• https://github.com/baserproject/basercms/releases/tag/5.2.3 Release Notes