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TI-2026-28379 Aliases CVE-2026-39394GHSA-vfhx-5459-qhqh

CI4MS has an .env CRLF Injection via Unvalidated `host` Parameter in Install Controller

Priority HIGH 76CWE-93Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00525 44th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed ci4ms (ci4-cms-erp): 0.31.4.0ci4-cms-erp/ci4ms (Packagist): 0.31.4.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ci4-cms-erpci4msbefore 0.31.4.00.31.4.0Patch availableCNA
—ci4-cms-erp/ci4ms (Packagist)before 0.31.4.00.31.4.0Patch availableGHSA-vfhx-5459-qhqh
  • ci4ms Vendorci4-cms-erp Affected before 0.31.4.0 Fixed in 0.31.4.0 Patch available CNA
  • ci4-cms-erp/ci4ms (Packagist) Vendor— Affected before 0.31.4.0 Fixed in 0.31.4.0 Patch available GHSA-vfhx-5459-qhqh

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:ci4-cms-erp:ci4ms:*:*:*:*:*:*:*:*before 0.31.4.0Vulnerableci4-cms-erp
  • cpe:2.3:a:ci4-cms-erp:ci4ms:*:*:*:*:*:*:*:* Versions before 0.31.4.0 Vulnerable ·ci4-cms-erp

Remediation

  • Fix · CNA ci4ms (ci4-cms-erp) Fixed in 0.31.4.0
  • Fix · GHSA-vfhx-5459-qhqh ci4-cms-erp/ci4ms (Packagist) Fixed in 0.31.4.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-39394
  2. 2026-10-03 Alias added: GHSA-vfhx-5459-qhqh

References

Exploit 1

Advisory 1

Other 2

  • TI-2026-26819 Improper access control in ci4-cms-erp ci4ms CVSS 3.1HIGH 8.8
  • TI-2026-27211 Cross-site scripting in ci4-cms-erp ci4ms CVSS 4.0CRITICAL 9.4
  • TI-2026-26820 Cross-site scripting in ci4-cms-erp ci4ms CVSS 3.1CRITICAL 10.0
  • TI-2026-26818 CI4MS: Blogs Categories Full Account Takeover for All-Roles & Privilege-Escalation via Stored DOM XSS CVSS 3.1CRITICAL 10.0
  • TI-2026-27238 Cross-site scripting in ci4-cms-erp ci4ms CVSS 3.1CRITICAL 9.0
  • TI-2026-26821 Improper access control in ci4-cms-erp ci4ms CVSS 3.1HIGH 8.8
See all 26 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences