Post-Installation Re-entry via Cache-Dependent Install Guard Bypass in ci4ms

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.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

关键功能的认证机制缺失

CI4MS 访问控制错误漏洞

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。

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