EUVD-2026-18089
GHSA-8fq3-c5w3-pj3q
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
4DescriptionGitHub Advisory
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.
AnalysisAI
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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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires valid authenticated user account in CI4MS versions prior to 0.31.0.0. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 8.8 severity is justified by the attack profile: network-accessible (AV:N), low complexity (AC:L), requiring only low privileges (PR:L) with no user interaction (UI:N), enabling high impact across confidentiality, integrity, and availability (C:H/I:H/A:H). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An organization terminates a developer's employment and immediately deactivates their CI4MS administrator account following standard offboarding procedures. The developer, still logged into the CMS from their home workstation with an active session established days earlier, discovers their portal access remains functional despite the account deactivation. … |
| Remediation | Upgrade immediately to CI4MS version 0.31.0.0 or later, which implements session invalidation logic tied to account state changes. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
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. …
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