CVE-2026-41891: CI4MS has a Deactivated User Session Bypass (active=0)

CVE-2026-41891 · Severity: medium · CVSS 4 · Published 2026-05-07

CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC authorization and theme support. From version 0.26.0 to before version 0.31.8.0, the auth filter has the deactivated/banned user check commented out. This issue has been patched in version 0.31.8.0.

Technologies: ci4-cms-erp/ci4ms (Packagist). Vendors: Packagist.

Quick answers

Is CVE-2026-41891 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-41891 being exploited in the wild.
How severe is CVE-2026-41891?
Medium severity, with a CVSS score of 4, published 7 May 2026.
Which products and versions are affected?
ci4-cms-erp/ci4ms (Packagist) ECOSYSTEM:introduced=0.26.0,fixed=0.31.8.0.
Is there a fix for CVE-2026-41891?
Yes. ci4-cms-erp/ci4ms (Packagist): upgrade to 0.31.8.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2026-41891?
Check whether you run ci4-cms-erp/ci4ms (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • ci4-cms-erp/ci4ms (Packagist): upgrade to 0.31.8.0 or later
    composer require ci4-cms-erp/ci4ms:^0.31.8.0

Affected products

  • ci4-cms-erp/ci4ms (Packagist) ECOSYSTEM:introduced=0.26.0,fixed=0.31.8.0

Identifiers

  • CVE-2026-41891
  • GHSA-5hfv-c864-qcq9

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