CVE-2026-21861— baserCMS: OS Command Injection Leading to Remote Code Execution (RCE)
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I. Basic Information for CVE-2026-21861
Vulnerability Information
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Vulnerability Title
baserCMS: OS Command Injection Leading to Remote Code Execution (RCE)
Source: NVD (National Vulnerability Database)
Vulnerability Description
baserCMS is a website development framework. Prior to version 5.2.3, baserCMS contains an OS command injection vulnerability in the core update functionality. An authenticated administrator can execute arbitrary OS commands on the server due to improper handling of user-controlled input that is directly passed to exec() without sufficient validation or escaping. 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:C/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
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，该漏洞源于核心更新功能存在OS命令注入，可能导致经过身份验证的管理员执行任意OS命令。
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)
Shenlong Deep Dive — AI Deep Analysis
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Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| baserproject | basercms | < 5.2.3 | - |
II. Public POCs for CVE-2026-21861
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POCPremium
Qwen3.6-35B-A3B · 7102 chars
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III. Intelligence Information for CVE-2026-21861
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Advisory · 2Vendor · 1
- 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-2026-21861
Same Patch Batch · baserproject · 2026-03-31 · 9 CVEs total
| 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-2026-30940 | 7.2 HIGH | baserCMS: Path Traversal in Theme File API Leads to Arbitrary File Write and 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-2026-30940
baserCMS: Path Traversal in Theme File API Leads to Arbitrar - CVE-2026-30878
baserCMS: Mail Form Acceptance Bypass via Public API - CVE-2026-30877
baserCMS: OS Command Injection in the baserCMS Update Functi
Same vendor: baserproject
- CVE-2026-32734
baserCMS: Multiple vulnerabilities in baserCMS - CVE-2026-30879
baserCMS: Cross-site scripting vulnerability in blog post - CVE-2026-30940
baserCMS: Path Traversal in Theme File API Leads to Arbitrar - CVE-2026-30878
baserCMS: Mail Form Acceptance Bypass via Public API - CVE-2026-30877
baserCMS: OS Command Injection in the baserCMS Update Functi
Same weakness: CWE-78
- CVE-2026-8603
Improper neutralization of special elements used in an OS co - CVE-2026-27130
Dokploy has Command Injection in its Service Operations - CVE-2026-25244
WebdriverIO has Command Injection in the BrowserStack Servic - CVE-2026-8767
vercel ai PR Branch Name Interpolation prettier-on-automerge - CVE-2026-45036
Tabby auto-confirms ZMODEM detection on terminal output, lea
V. Comments for CVE-2026-21861
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