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CVE-2026-41587— CI4MS: Unrestricted PHP File Upload via Theme Installation Leads to Authenticated Remote Code Execution

Quick assessment

Affected
ci4-cms-erp ci4ms
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.

CI4MS是Ci4MS开源的一个博客页面管理工具。 CI4MS 0.26.0.0至0.31.7.0之前版本存在代码问题漏洞，该漏洞源于主题上传功能未过滤ZIP文件中的PHP文件，可能导致经过身份验证的用户通过上传特制ZIP文件实现远程代码执行。

AI Predicted 8.1 Difficulty: Easy EPSS 0.50% · P41

Affected Version Matrix 1

VendorProduct Version RangeStatus
ci4-cms-erp ci4ms >= 0.26.0.0, < 0.31.7.0 affected
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I. Basic Information for CVE-2026-41587

Vulnerability Information
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Vulnerability Title
CI4MS: Unrestricted PHP File Upload via Theme Installation Leads to Authenticated Remote Code Execution
Source: CVE Program / CVE List V5
Vulnerability Description
CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC authorization and theme support. From version 0.26.0.0 to before version 0.31.7.0, a theme upload feature allows any authenticated backend user with theme-upload permission to achieve remote code execution (RCE) by uploading a crafted ZIP file. PHP files inside the ZIP are installed into the web-accessible public/ directory with no extension or content filtering, making them directly executable via HTTP. This issue has been patched in version 0.31.7.0.
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
危险类型文件的不加限制上传
Source: CVE Program / CVE List V5
Vulnerability Title
CI4MS 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CI4MS是Ci4MS开源的一个博客页面管理工具。 CI4MS 0.26.0.0至0.31.7.0之前版本存在代码问题漏洞，该漏洞源于主题上传功能未过滤ZIP文件中的PHP文件，可能导致经过身份验证的用户通过上传特制ZIP文件实现远程代码执行。
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
ci4-cms-erp ci4ms >= 0.26.0.0, < 0.31.7.0 -

II. Public POCs for CVE-2026-41587

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III. Intelligence Information for CVE-2026-41587

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Patches & Fixes for CVE-2026-41587 (1)

Vendor Advisories for CVE-2026-41587 (1)

Same Patch Batch · ci4-cms-erp · 2026-05-07 · 6 CVEs total

CVE-2026-41201 9.1 CRITICAL CI4MS: Backup Management Full Account Takeover for All-Roles & Privilege-Escalation via St
CVE-2026-41202 ci4ms Backup::restore is vulnerable to Zip Slip leading to RCE
CVE-2026-41890 CI4MS: Arbitrary Database Table Drop via Theme deleteProcess
CVE-2026-41203 ci4ms Theme::upload is vulnerable to Zip Slip leading to RCE
CVE-2026-41891 CI4MS: Deactivated User Session Bypass (active=0)

IV. Related Vulnerabilities

Same product: ci4ms
Same vendor: ci4-cms-erp
Same weakness: CWE-434

V. Comments for CVE-2026-41587

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