CVE-2026-30940

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

CVSS 7.2 HIGHEPSS 1.0%CWE-22 CWE-73

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 7.2EPSS 1.0%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

31 Mar 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Affected products

baserproject · basercms

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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