CVE-2026-41203

ci4ms Theme::upload is vulnerable to Zip Slip leading to RCE

Published May 7, 2026 CVSS 4.0 · 9.4 Critical EPSS < 1% KEV · Not listed
Description
CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC authorization and theme support. Prior to version 0.31.5.0, ci4ms Theme::upload extracts user uploaded ZIP archives without validating entry names, allowing an authenticated backend user with the theme create permission to write files to arbitrary filesystem locations (Zip Slip) and achieve remote code execution by dropping a PHP file under the public web root. This issue has been patched in version 0.31.5.0.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-xv3r-vr59-95rg CI4MS Theme::upload is vulnerable to Zip Slip leading to RCE
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Ci4-cms-erp
Ci4-cms-erp ci4ms
Vendors & Products Ci4-cms-erp
Ci4-cms-erp ci4ms
Type Values Removed Values Added
Description CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC authorization and theme support. Prior to version 0.31.5.0, ci4ms Theme::upload extracts user uploaded ZIP archives without validating entry names, allowing an authenticated backend user with the theme create permission to write files to arbitrary filesystem locations (Zip Slip) and achieve remote code execution by dropping a PHP file under the public web root. This issue has been patched in version 0.31.5.0.
Title ci4ms Theme::upload is vulnerable to Zip Slip leading to RCE
Weaknesses CWE-22
References
Metrics cvssV4_0

{'score': 9.4, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
May 7, 2026, 1:49 PM
Reserved
Apr 18, 2026, 2:51 AM
Status
Deferred
Published
May 7, 2026, 4:16 AM
Modified
Oct 26, 2026, 7:10 PM