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CVE-2026-40187— Authenticated RCE via Malicious eTemplate Upload in EGroupware

Quick assessment

Affected
EGroupware egroupware
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

EGroupware是EGroupware公司开源的一个在线办公平台。 EGroupware 26.0及之前版本存在安全漏洞，该漏洞源于Widget::expand_name()方法将模板widget属性值直接传递给PHP eval()调用且反引号字符未转义，可能导致已认证管理员通过上传恶意eTemplate XML文件到VFS /etemplates挂载点实现远程代码执行。

AI Predicted 8.8 Difficulty: Easy EPSS 0.86% · P58

Affected Version Matrix 1

VendorProduct Version RangeStatus
EGroupware egroupware <= 26.0 affected
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I. Basic Information for CVE-2026-40187

Vulnerability Information
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Vulnerability Title
Authenticated RCE via Malicious eTemplate Upload in EGroupware
Source: CVE Program / CVE List V5
Vulnerability Description
In egroupware version 26.0 and earlier, an authenticated administrator can achieve OS-level Remote Code Execution (RCE) by uploading a malicious eTemplate XML file (`.xet`) to the VFS `/etemplates` mount. The `Widget::expand_name()` method passes template widget attribute values directly into a PHP `eval()` call with only double-quote escaping applied - **backtick characters are not escaped**. In PHP, backticks inside a double-quoted `eval()` string execute shell commands. This allows an admin-level user to escalate from web application access to arbitrary OS command execution on the server.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
Vulnerability Title
EGroupware 命令注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
EGroupware是EGroupware公司开源的一个在线办公平台。 EGroupware 26.0及之前版本存在安全漏洞，该漏洞源于Widget::expand_name()方法将模板widget属性值直接传递给PHP eval()调用且反引号字符未转义，可能导致已认证管理员通过上传恶意eTemplate XML文件到VFS /etemplates挂载点实现远程代码执行。
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
EGroupware egroupware <= 26.0 -

II. Public POCs for CVE-2026-40187

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III. Intelligence Information for CVE-2026-40187

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Patches & Fixes for CVE-2026-40187 (1)

IV. Related Vulnerabilities

Same product: egroupware
Same vendor: EGroupware
Same weakness: CWE-78

V. Comments for CVE-2026-40187

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