CVE-2026-54611— InstantCMS has Remote Code Execution in package installer
Quick assessment
Affected
instantsoft icms2
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.
InstantCMS 是一款免费且开源的内容管理系统。在 2.18.2 之前的版本中存在远程代码执行（RCE）漏洞，允许经过身份验证的远程攻击者通过组件安装器执行任意 PHP 代码。攻击者可以将一个恶意组件上传至服务器，虽然该组件不会被安装，但上传的文件会被执行。通常，上传目录中的所有 PHP 文件默认不会被执行，但通过上传自定义的 文件，可以使这些文件得以执行。版本 2.18.2 已包含对该漏洞的修复。
Possible ATT&CK Techniques 3 AI
T1059.004 · Unix Shell T1105 · Ingress Tool Transfer T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| instantsoft | icms2 | < 2.18.2 |
affected |
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I. Basic Information for CVE-2026-54611
Vulnerability Information
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Vulnerability Title
InstantCMS has Remote Code Execution in package installer
Source: CVE Program / CVE List V5
Vulnerability Description
InstantCMS is a free and open source content management system. Versions prior to 2.18.2 have a Remote Code Execution (RCE) issue that allows remote authenticated attackers to execute any PHP code via the component installer. It is possible to upload a malicious component into the server, however, it won't be installed, but upload files will be executed. Normally all php files in upload folder are not executed, however, by uploading custom .htaccess it becomes possible. Version 2.18.2 contains a fix.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| instantsoft | icms2 | < 2.18.2 | - |
|
II. Public POCs for CVE-2026-54611
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-54611 (1)
IV. Related Vulnerabilities
Same product: icms2
-
CVE-2026-48707
InstantCMS vulnerable to SSRF via upload redirect bypass all -
CVE-2026-28281
InstantCMS has Multiple CSRF Vulnerabilities -
CVE-2025-59055
InstantCMS vulnerable to Server-Side Request Forgery via pac -
CVE-2024-50348
InstantCMS has a Cross Site Scripting Vulnerability -
CVE-2024-31213
InstantCMS Open Redirect vulnerability
Same vendor: instantsoft
-
CVE-2026-48707
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CVE-2026-28281
InstantCMS has Multiple CSRF Vulnerabilities -
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InstantCMS vulnerable to Server-Side Request Forgery via pac -
CVE-2024-50348
InstantCMS has a Cross Site Scripting Vulnerability -
CVE-2024-31213
InstantCMS Open Redirect vulnerability
Same weakness: CWE-94
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V. Comments for CVE-2026-54611
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