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CVE-2026-39393— Post-Installation Re-entry via Cache-Dependent Install Guard Bypass in ci4ms

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 0.31.4.0之前版本存在访问控制错误漏洞，该漏洞源于安装路由防护仅依赖易失性缓存检查，可能导致数据库暂时不可访问时防护失效，允许未经验证的攻击者覆盖.env文件并实现完全应用程序接管。

CVSS 8.1 · High EPSS 0.40% · P34
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I. Basic Information for CVE-2026-39393

Vulnerability Information
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Vulnerability Title
Post-Installation Re-entry via Cache-Dependent Install Guard Bypass in ci4ms
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. Prior to 0.31.4.0, the install route guard in ci4ms relies solely on a volatile cache check (cache('settings')) combined with .env file existence to block post-installation access to the setup wizard. When the database is temporarily unreachable during a cache miss (TTL expiry or admin-triggered cache clear), the guard fails open, allowing an unauthenticated attacker to overwrite the .env file with attacker-controlled database credentials, achieving full application takeover. This vulnerability is fixed in 0.31.4.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
CI4MS 访问控制错误漏洞
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 0.31.4.0之前版本存在访问控制错误漏洞，该漏洞源于安装路由防护仅依赖易失性缓存检查，可能导致数据库暂时不可访问时防护失效，允许未经验证的攻击者覆盖.env文件并实现完全应用程序接管。
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 < 0.31.4.0 -

II. Public POCs for CVE-2026-39393

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III. Intelligence Information for CVE-2026-39393

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Vendor Advisories for CVE-2026-39393 (1)

Same Patch Batch · ci4-cms-erp · 2026-04-08 · 6 CVEs total

CVE-2026-39394 8.1 HIGH CI4MS has an .env CRLF Injection via Unvalidated `host` Parameter in Install Controller
CVE-2026-39389 6.7 MEDIUM CI4MS has a Hidden Items Authorization Bypass in Fileeditor Allows Reading Secrets and Wri
CVE-2026-39390 5.5 MEDIUM CI4MS has Stored XSS via srcdoc attribute bypass in Google Maps iframe setting
CVE-2026-39392 5.5 MEDIUM CI4MS has Stored XSS in Pages Content Due to Missing html_purify Sanitization
CVE-2026-39391 4.8 MEDIUM CI4MS has Stored XSS via Unescaped Blacklist Note in Admin User List

IV. Related Vulnerabilities

Same product: ci4ms
Same vendor: ci4-cms-erp
Same weakness: CWE-306