CVE-2026-30940

EUVD-2026-17267

31.03.2026, 01:16

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.

Path Traversal

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	Primary	7.2 HIGH	NETWORK	LOW	HIGH	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Base Score

CVSS 3.x

EPSS Score

Percentile: 67%

Affected Products (NVD)

Vendor	Product	Version
basercms	basercms	𝑥 < 5.2.3

𝑥

= Vulnerable software versions

Known Exploits!

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

Common Weakness Enumeration

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
The software uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the software does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

References

https://basercms.net/security/JVN_20837860

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

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