CVE-2026-34989: CI4MS affected by Profile & User 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: 2026-04-06 · updated 2026-10-23
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 31.0.0.0, the application fails to properly sanitize user-controlled input when users update their profile name (e.g., full name / username). An attacker can inject a malicious JavaScript payload into their profile name, which is then stored server-side. This stored payload is later rendered unsafely in multiple application views without proper output encoding, leading to stored cross-site scripting (XSS). This vulnerability is fixed in 31.0.0.0.

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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