CVE-2026-30940— baserCMS: Path Traversal in Theme File API Leads to Arbitrary File Write and RCE
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: NVD (National Vulnerability Database)
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 |
|---|
AI-Generated POCPremium
Qwen3.6-35B-A3B · 14656 chars
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III. Intelligence Information for CVE-2026-30940
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- 2026/03/26 baserCMSにXSSをはじめとする複数の脆弱性x_refsource_MISC
- Release baserCMS 5.2.3 リリース · baserproject/basercms · GitHubx_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-30940
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
- CVE-2026-32734
baserCMS: Multiple vulnerabilities in baserCMS - CVE-2026-30879
baserCMS: Cross-site scripting vulnerability in blog post - CVE-2026-30878
baserCMS: Mail Form Acceptance Bypass via Public API - CVE-2026-30877
baserCMS: OS Command Injection in the baserCMS Update Functi - CVE-2026-30880
baserCMS: OS command injection vulnerability in installer
Same vendor: baserproject
- CVE-2026-32734
baserCMS: Multiple vulnerabilities in baserCMS - CVE-2026-30879
baserCMS: Cross-site scripting vulnerability in blog post - CVE-2026-30878
baserCMS: Mail Form Acceptance Bypass via Public API - CVE-2026-30877
baserCMS: OS Command Injection in the baserCMS Update Functi - CVE-2026-30880
baserCMS: OS command injection vulnerability in installer
Same weakness: CWE-22
- CVE-2026-8274
npitre cramfs-tools Directory cramfsck.c do_directory path t - CVE-2022-50956
WordPress Plugin amministrazione-aperta 3.7.3 Local File Rea - CVE-2026-8215
Industrial Application Software IAS Canias ERP RMI iasReques - CVE-2026-42605
AzuraCast: Path Traversal in `currentDirectory` Parameter En - CVE-2026-42574
apko dirFS has a symlink-following path traversal that allow
V. Comments for CVE-2026-30940
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