CVE-2026-30940
High
Description
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.
SeverityHigh
CVSS7.2
Exploit probability—
ProductBasercms
PublishedMar 31, 2026
First seenMar 31, 2026
Weakness typeCWE-22Path traversalCWE-73CWE-73
How to fix
Update
- basercms basercms5.2.3 or later
- baserproject/basercms5.2.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| basercms basercms | v < 5.2.3 | 5.2.3 |
| baserproject/basercmsPackagist | v < 5.2.3 | 5.2.3 |
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