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CVE-2026-39393

Ci4-cms-erp Ci4ms authentication bypass

8.1 HIGHPublic exploitEPSS 0.40%
  1. Published8 Apr 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityHigh
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Ci4-cms-erp Ci4ms< 0.31.4.0

Remediation

Fixed in
Ci4-cms-erp Ci4ms≥ 0.31.4.0

References

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Frequently asked

Is CVE-2026-39393 being actively exploited?

CVE-2026-39393 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.40%.

How severe is CVE-2026-39393?

CVE-2026-39393 has a CVSS 3.1 base score of 8.1, rated high. EPSS estimates a 0.40% probability of exploitation.

Which products are affected by CVE-2026-39393?

Affected products include Ci4-cms-erp Ci4ms.

How do I fix CVE-2026-39393?

Upgrade affected software to a fixed version, for example Ci4-cms-erp Ci4ms 0.31.4.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-39393 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.