Is CVE-2026-39393 actively exploited?

No active exploitation of CVE-2026-39393 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-39393 be exploited remotely?

Yes. CVE-2026-39393 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-39393?

CVE-2026-39393 has a CVSS score of 8.1 (HIGH).

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HIGH

CVE-2026-39393

CWE-306Published: April 8, 2026· Updated: Apr 8, 2026

8.1

CVSS v3.1

EPSS:0.01%probability of exploitation in 30 daysPercentile:3.0th

Official 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.

NVD Source

Technical Analysis

CVE-2026-39393 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.1.