CVE-2026-30940 — baserCMS: Path Traversal in Theme File API Leads to Arbitrary File Write and RCE
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…
Published: 2026-03-31 · CVSS: 7.2 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7