What’s Vulnerable › Vulnerabilities
CVE-2026-39393: Post-Installation Re-entry via Cache-Dependent Install Guard Bypass in ci4ms
- Severity: high (CVSS 8.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2026-04-08 · updated 2026-07-24
- Weakness: CWE-306
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.
Affected products
- ci4-cms-erp ci4ms: before 0.31.4.0 — fixed in 0.31.4.0
How to fix
Upgrade to a fixed version: ci4-cms-erp ci4ms 0.31.4.0. Check the vendor advisory for mitigations.
References
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