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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)
Affected Products
VendorProductAffected VersionsCPESubscribe
baserprojectbasercms < 5.2.3 -
II. Public POCs for CVE-2026-21861
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III. Intelligence Information for CVE-2026-21861
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IV. Related Vulnerabilities
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