CVE-2026-39394 json
CI4MS has an .env CRLF Injection via Unvalidated `host` Parameter in Install Controller
published 2026-04-08 7 mo ago modified 2026-07-24 3 mo ago also EUVD-2026-20489 , GHSA-vfhx-5459-qhqh
- cvss
- 8.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 44%
- public exploits
- 0
- none known
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.
Patch / fix
- packagist ci4-cms-erp/ci4ms 0.31.4.0
- ci4-cms-erp ci4ms 0.31.4.0
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- total
- Assessed
- 7 mo ago
Exploit prediction
0.53% chance of exploitation in the next 30 days, higher than 44% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-vfhx-5459-qhqh referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
| GitHub | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | ci4-cms-erp/ci4ms | <0.31.4.0 |
0.31.4.0 |
Affected products
- ci4-cms-erp ci4ms
Classification
- Weakness
-
- CWE-93 Improper Neutralization of CRLF Sequences
References
-
github.com
/ci4-cms-erp/ci4ms/security/advisories/GHSA-vfhx-5459-qhqh
exploit, web, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-39394
advisory
-
github.com
/ci4-cms-erp/ci4ms
package
-
github.com
/ci4-cms-erp/ci4ms/releases/tag/0.31.4.0
web
Sources
- CVE List CVE-2026-39394
- GitHub Advisory GHSA-vfhx-5459-qhqh
- NVD CVE-2026-39394
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.