EUVD-2026-20489
GHSA-vfhx-5459-qhqh
CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
4Tags
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::index() controller reads the host POST parameter without any validation and passes it directly into updateEnvSettings(), which writes it into the .env file via preg_replace(). Because newline characters in the value are not stripped, an attacker can inject arbitrary configuration directives into the .env file. The install routes have CSRF protection explicitly disabled, and the InstallFilter can be bypassed when cache('settings') is empty (cache expiry or fresh deployment). This vulnerability is fixed in 0.31.4.0.
Analysis
Environment variable injection in CI4MS CMS allows remote attackers to inject arbitrary configuration directives into the .env file during installation, potentially leading to full system compromise. Versions before 0.31.4.0 fail to sanitize newline characters in the host POST parameter, enabling attackers to bypass CSRF-disabled install routes and inject malicious configuration when InstallFilter validation fails. …
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Remediation
Within 24 hours: Identify all CI4MS CMS instances in production and staging; document current versions via administrative panels or version control. Within 7 days: Isolate affected installations (versions before 0.31.4.0) from untrusted networks if upgrade is delayed; implement network-level access controls restricting HTTP POST requests to the installation routes (/install* endpoints) to authorized administrators only. …
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