CVE-2026-30940

Name: CVE-2026-30940
Creator: NVD / NIST
Published: 2026-03-31T01:16:36.43+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.2/10EPSS 1.05%

Last modified Jun 17, 2026

CVE-2026-30940 is a high-severity vulnerability rated 7.2/10 on the CVSS scale. 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. EPSS estimates a 1.05% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.2/10

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

EPSS Probability

1.05%

59.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Basercms	Basercms	< 5.2.3

References

https://basercms.net/security/JVN_20837860Vendor Advisory
https://github.com/baserproject/basercms/releases/tag/5.2.3Release Notes
https://github.com/baserproject/basercms/security/advisories/GHSA-c5c6-37vq-pjcqExploit, Vendor Advisory

Timeline

Published: Mar 31, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-30940?

How severe is CVE-2026-30940?

CVE-2026-30940 has a CVSS score of 7.2/10 (HIGH severity). The EPSS model estimates a 1.05% probability of exploitation in the next 30 days.

How do I fix CVE-2026-30940?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-30940?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST