CVE-2026-34558: CI4MS: Methods Management Full Account Takeover for All-Roles & Privilege-Escalation via Stored DOM XSS

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).

Critically, because created methods are automatically rendered inside the system’s navigation/menu structure, the injected payload executes globally — meaning every page visited where the malicious method appears in the menu triggers the XSS payload automatically.

This significantly increases severity, as exploitation is not limited to a single view — it becomes a platform-wide persistent execution point.