CVE-2026-39394
CVE-2026-39394 is a high-severity vulnerability in Ci4-cms-erp Ci4ms with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-93.
Key facts
- Severity: High (CVSS 3.x base score 8.1)
- EPSS exploit prediction: 1% (40th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-20489
- Weakness: CWE-93
- Affected product: Ci4-cms-erp Ci4ms
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2026-39394?
- 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.
- How severe is CVE-2026-39394?
- CVE-2026-39394 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2026-39394 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-39394?
- CVE-2026-39394 affects Ci4-cms-erp Ci4ms. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-39394?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2026-39394 have an EU (EUVD) identifier?
- Yes. CVE-2026-39394 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20489.
- When was CVE-2026-39394 published?
- CVE-2026-39394 was published on 2026-04-08 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:ci4-cms-erp:ci4ms:*:*:*:*:*:*:*:*
More vulnerabilities in Ci4-cms-erp Ci4ms
- CVE-2026-34571 — Critical (CVSS 9.9): CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC…
- CVE-2026-34569 — Critical (CVSS 9.9): CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC…
- CVE-2026-25510 — Critical (CVSS 9.9): CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC…
- CVE-2026-34568 — Critical (CVSS 9.1): CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC…
- CVE-2026-34567 — Critical (CVSS 9.1): CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC…
- CVE-2026-34566 — Critical (CVSS 9.1): CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC…
All CVEs affecting Ci4-cms-erp Ci4ms →
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