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Stored DOM-based XSS in CI4MS Menu Management
CVE-2026-34565 is a stored DOM-based cross-site scripting vulnerability in CI4MS, a CodeIgniter 4-based CMS skeleton, affecting versions prior to 0.31.0.0. The flaw exists in the Menu Management functionality when adding Posts to navigation menus. User-controlled post-related data selected via the Posts section is stored server-side and later rendered without proper sanitization and output encoding. Because the stored values are injected back into administrative dashboards and public-facing navigation menus in an unsafe manner, attacker-supplied script can execute in the victim's browser.
What it means and what to do now: patch path, interim mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
Successful exploitation allows attacker-controlled JavaScript to execute in the context of the affected CI4MS application when the malicious menu content is rendered. Based on the provided context, this affects both administrative dashboards and public-facing navigation menus. This can expose sensitive data available to the victim's session, enable unauthorized actions in the victim's browser, alter displayed content, and potentially impact confidentiality, integrity, and availability across a changed security scope.
If you can’t patch tonight, do this now.
If immediate upgrade is not possible, restrict access to Menu Management and post/menu editing capabilities to only highly trusted users, review existing navigation menu entries and related post data for malicious payloads, and remove any untrusted content already stored in the application. Apply strict output encoding in affected templates and consider deploying a restrictive Content Security Policy to reduce XSS impact, though CSP is not a substitute for fixing the underlying flaw.
Patch, then assume compromise.
Upgrade CI4MS to version 0.31.0.0 or later, which contains the patch for this issue. Ensure that all user-controlled post/menu data is properly sanitized on input where appropriate and, critically, context-appropriately output encoded before rendering in administrative and public-facing views.
No public exploits tracked yet. Mallory keeps watching.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.