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CVE-2026-30940— baserCMS: Path Traversal in Theme File API Leads to Arbitrary File Write and RCE

Quick assessment

Affected
baserproject basercms
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

baserCMS是baserCMS团队的一套企业级内容管理系统（CMS）。 baserCMS 5.2.3之前版本存在安全漏洞，该漏洞源于主题文件管理API存在路径遍历，可能导致任意文件写入和远程代码执行。

CVSS 7.2 · High EPSS 1.05% · P61
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I. Basic Information for CVE-2026-30940

Vulnerability Information
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Vulnerability Title
baserCMS: Path Traversal in Theme File API Leads to Arbitrary File Write and RCE
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
baserCMS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
baserCMS是baserCMS团队的一套企业级内容管理系统（CMS）。 baserCMS 5.2.3之前版本存在安全漏洞，该漏洞源于主题文件管理API存在路径遍历，可能导致任意文件写入和远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
baserproject basercms < 5.2.3 -

II. Public POCs for CVE-2026-30940

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 14656 chars
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III. Intelligence Information for CVE-2026-30940

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Vendor Advisories for CVE-2026-30940 (2)

Vendor Pages for CVE-2026-30940 (1)

Same Patch Batch · baserproject · 2026-03-31 · 9 CVEs total

CVE-2026-21861 9.1 CRITICAL baserCMS: OS Command Injection Leading to Remote Code Execution (RCE)
CVE-2026-30877 9.1 CRITICAL baserCMS: OS Command Injection in the baserCMS Update Functionality
CVE-2025-32957 8.7 HIGH baserCMS: unsafe File Upload Leading to Remote Code Execution (RCE)
CVE-2026-32734 7.1 HIGH baserCMS: Multiple vulnerabilities in baserCMS
CVE-2026-30878 5.3 MEDIUM baserCMS: Mail Form Acceptance Bypass via Public API
CVE-2026-27697 baserCMS: SQL injection vulnerability in blog post
CVE-2026-30880 baserCMS: OS command injection vulnerability in installer
CVE-2026-30879 baserCMS: Cross-site scripting vulnerability in blog post

IV. Related Vulnerabilities

Same product: basercms
Same vendor: baserproject
Same weakness: CWE-22

V. Comments for CVE-2026-30940

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