---
title: "CVE-2026-34560: CI4MS: Logs Full Account Takeover for All-Roles & Privilege-Escalation via Stored DOM XSS"
url: https://erroneo.us/security/cve/CVE-2026-34560/
description: "CVE-2026-34560 (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: 2026-04-01
date_modified: 2026-04-06
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-34560"
kev: false
cvss: 9.1
epss: 0.00462
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-34560: CI4MS: Logs Full Account Takeover for All-Roles & Privilege-Escalation via Stored DOM XSS

**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 0.5% , percentile 39: FIRST’s model estimates a 0.5% chance of exploitation activity in the next 30 days, higher than 39% of all scored CVEs (low). 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)) <= 0.28.6.0, fixed in 0.31.0.0 . 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 0.31.0.0, the application renders user-controlled input unsafely within the logs interface. If any stored XSS payload exists within logged data, it is rendered without proper output encoding. This issue becomes a Blind XSS scenario because the attacker does not see immediate execution. Instead, the payload is stored within application logs and only executes later when an administrator views the logs page. This issue has been patched in version 0.31.0.0.

## Affected packages

- Composer (PHP) `ci4-cms-erp/ci4ms` <= 0.28.6.0 → fixed: 0.31.0.0

## Affected products (CVE record)

- ci4-cms-erp ci4ms: < 0.31.0.0

## Severity

- GitHub_M CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L`
- GitHub CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable no , technical impact partial .
- FIRST EPSS (model of 2026-10-21): 0.46% probability of exploitation activity in the next 30 days; percentile 39.

## Sources

- [GitHub Advisory GHSA-r4v5-rwr2-q7r4](https://github.com/advisories/GHSA-r4v5-rwr2-q7r4)
- [CVE.org record CVE-2026-34560](https://www.cve.org/CVERecord?id=CVE-2026-34560)
- [NVD entry CVE-2026-34560](https://nvd.nist.gov/vuln/detail/CVE-2026-34560)
- [github.com](https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-r4v5-rwr2-q7r4)
- [github.com](https://github.com/ci4-cms-erp/ci4ms/releases/tag/0.31.0.0)

---
Source page: https://erroneo.us/security/cve/CVE-2026-34560/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt