PT-2026-29152 · Basercms · Basercms

Kaminuma · Published 2026-03-31 · Updated 2026-03-31 · CVE-2026-30940

Positive Technologies (AI Summary)

CVSS v3.1

7.2

High

Base vector

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

Name of the Vulnerable Software and Affected Versions baserCMS versions prior to 5.2.3

Description baserCMS is a website development framework. A path traversal flaw exists in the theme file management API, specifically at the ''/baser/api/admin/bc-theme-file/theme files/add.json'' endpoint. An authenticated administrator can manipulate the path parameter using '..' sequences to create PHP files in locations outside the intended theme directory. This could lead to remote code execution (RCE). The vulnerable parameter is the path parameter.

Recommendations Update to version 5.2.3 or later.

Exploit

Fix

RCE

Path traversal

Weakness Enumeration

CWE-73

CWE-22

Related Identifiers

CVE-2026-30940

GHSA-C5C6-37VQ-PJCQ

Affected Products

Basercms

References · 12

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30940.json · Exploit
• https://github.com/baserproject/basercms/security/advisories/GHSA-c5c6-37vq-pjcq · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-30940 · Vendor Advisory
• https://basercms.net/security/JVN_20837860 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-30940 · Security Note
• https://osv.dev/vulnerability/GHSA-c5c6-37vq-pjcq · Vendor Advisory
• https://github.com/baserproject/basercms · Note
• https://github.com/baserproject/basercms/releases/tag/5.2.3 · Note
• https://twitter.com/CVEarity/status/2038909224441528739 · Twitter Post
• https://twitter.com/CVEnew/status/2038916054672658929 · Twitter Post
• https://twitter.com/cyberbivash/status/2038835935765238023 · Twitter Post
• https://twitter.com/kaminuma_dev/status/2038920602967478611 · Twitter Post