CVE-2026-34565: CI4MS: Menu Management (Posts) Full Account Takeover for All-Roles & Privilege-Escalation via Stored DOM XSS

April 1, 2026 (updated April 6, 2026)

The application fails to properly sanitize user-controlled input when adding Posts to navigation menus through the Menu Management functionality. Post-related data selected via the Posts section is stored server-side and rendered without proper output encoding.

These stored values are later rendered unsafely within administrative dashboards and public-facing navigation menus, resulting in stored DOM-based cross-site scripting (XSS).

References

github.com/advisories/GHSA-xgh5-w62m-8mpr
github.com/ci4-cms-erp/ci4ms
github.com/ci4-cms-erp/ci4ms/releases/tag/0.31.0.0
github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-xgh5-w62m-8mpr
nvd.nist.gov/vuln/detail/CVE-2026-34565

Code Behaviors & Features

Detect and mitigate CVE-2026-34565 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Learn more about Dependency Scanning →