What’s Vulnerable › Vulnerabilities
CVE-2026-34558: CI4MS: Methods Management Full Account Takeover for All-Roles & Privilege-Escalation via Stored DOM XSS
- Severity: critical (CVSS 9.0 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2026-03-30 · updated 2026-06-17
- Weakness: CWE-79
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 0.31.0.0, the application fails to properly sanitize user-controlled input within the Methods Management functionality when creating or managing application methods/pages. Multiple input fields accept attacker-controlled JavaScript payloads that are stored server-side without sanitization or output encoding. These stored values are later rendered directly into administrative interfaces and global navigation components without proper encoding, resulting in Stored DOM-Based Cross-Site Scripting (XSS). This issue has been patched in version 0.31.0.0.
Affected products
- ci4-cms-erp ci4ms: before 0.31.0.0 — fixed in 0.31.0.0
How to fix
Upgrade to a fixed version: ci4-cms-erp ci4ms 0.31.0.0. Check the vendor advisory for mitigations.
References
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