CVE-2026-30940

HIGH7.2

baserCMS: Path Traversal in Theme File API Leads to Arbitrary File Write and RCE

Published Mar 31, 2026

Modified 4 weeks ago

Details

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.

References

WEB

https://basercms.net/security/JVN_20837860

WEB

https://github.com/baserproject/basercms/releases/tag/5.2.3

WEB

https://github.com/baserproject/basercms/security/advisories/GHSA-c5c6-37vq-pjcq

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-30940

CVSS Analysis

CVSS v3.1

7.2