---
title: "CVE-2026-41202: CI4MS Backup::restore is vulnerable to Zip Slip leading to RCE"
url: https://erroneo.us/security/cve/CVE-2026-41202/
description: "CVE-2026-41202 (ci4-cms-erp/ci4ms (Composer (PHP))): CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-05-07
date_modified: 2026-05-08
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-41202"
kev: false
cvss: 9.4
epss: 0.00724
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-41202: CI4MS Backup::restore is vulnerable to Zip Slip leading to RCE

**Signal:** Critical, preconditions apply. Severe if exploited, but exploitation needs conditions that may not apply to you. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Not in CISA KEV , but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 0.7% , percentile 53: FIRST’s model estimates a 0.7% chance of exploitation activity in the next 30 days, higher than 53% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Needs an account (low (any account)). Exposure depends on who can log in.
- Only applies if your dependency tree includes ci4-cms-erp/ci4ms (Composer (PHP)) < 0.31.5.0, fixed in 0.31.5.0 . Check your lockfile, including transitive dependencies.

## What it is

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 Backup::restore extracts user uploaded ZIP archives without validating entry names, allowing an authenticated backend user with the backup 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.

## Affected packages

- Composer (PHP) `ci4-cms-erp/ci4ms` < 0.31.5.0 → fixed: 0.31.5.0

## Affected products (CVE record)

- ci4-cms-erp ci4ms: < 0.31.5.0

## Severity

- GitHub_M CVSS 4.0: 9.4 `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`
- GitHub CVSS 4.0: 9.4 `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`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.72% probability of exploitation activity in the next 30 days; percentile 53.

## Sources

- [GitHub Advisory GHSA-xp9f-pvvc-57p4](https://github.com/advisories/GHSA-xp9f-pvvc-57p4)
- [CVE.org record CVE-2026-41202](https://www.cve.org/CVERecord?id=CVE-2026-41202)
- [NVD entry CVE-2026-41202](https://nvd.nist.gov/vuln/detail/CVE-2026-41202)
- [github.com](https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-xp9f-pvvc-57p4)
- [github.com](https://github.com/ci4-cms-erp/ci4ms/releases/tag/0.31.5.0)

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Source page: https://erroneo.us/security/cve/CVE-2026-41202/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt