EUVD-2026-18089
GHSA-8fq3-c5w3-pj3q
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
4Description
CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC authorization and theme support. Prior to version 0.31.0.0, the application fails to immediately revoke active user sessions when an account is deactivated. Due to a logic flaw in the backend design, account state changes are enforced only during authentication (login), not for already-established sessions. The system implicitly assumes that authenticated users remain trusted for the lifetime of their session. There is no session expiration or account expiration mechanism in place, causing deactivated accounts to retain indefinite access until the user manually logs out. This behavior breaks the intended access control policy and results in persistent unauthorized access, representing a critical security flaw. This issue has been patched in version 0.31.0.0.
Analysis
Session fixation vulnerability in CI4MS (CodeIgniter 4 CMS) allows deactivated user accounts to maintain indefinite access through active sessions. Authenticated attackers whose accounts have been administratively disabled retain full high-privilege access (confidentiality, integrity, availability impact) until manual logout, bypassing intended access controls. …
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Remediation
Within 24 hours: Inventory all CI4MS deployments and document current version numbers; identify deactivated user accounts created in the past 90 days and force immediate session termination via database or CMS administrative backend. Within 7 days: Implement mandatory account logout on administrative deactivation by developing a custom patch or deploying an authentication middleware that invalidates all sessions for disabled users on each request; monitor login/audit logs for anomalous activity from deactivated accounts. …
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External POC / Exploit Code
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