GHSA-xgh5-w62m-8mpr CI4MS: Menu Management (Posts) Full Account Takeover for All-Roles & Privilege-Escalation via Stored DOM XSS
Summary**Vulnerability: Stored DOM XSS via Posts Added to Menu (Persistent Payload Injection)**Stored Cross-Site Scripting via Unsafe Rendering of Post Entries in Menu ManagementDescriptionThe 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).Affected FunctionalityMenu Management – Posts sectionAdding posts to navigation menusMenu storage and rendering logicAttack ScenarioAn attacker creates or controls a post containing a malicious JavaScript payload.The attacker adds the post to the menu using the **Posts** functionality in Menu Manager.The application stores the menu entry without sanitization or encoding.The payload persists and executes whenever the menu is rendered.ImpactPersistent Stored DOM XSSExecution of arbitrary JavaScript in victims’ browsersPrivilege escalation in administrative contextsFull administrator account takeoverFull account takeover across all rolesFull compromise of the entire application via global navigation executionEndpoint:`/backend/menu/`Steps To Reproduce (POC)Navigate to Menu ManagementUse the **Posts** section to add a post containing an XSS payload such as:
`<img src=x onerror=alert(document.domain)>`Save the menuView the menu in the administrative panel or any public-facing pageObserve the JavaScript payload executing automaticallyRemediation**Avoid unsafe DOM manipulation methods:** Do not use `.html()`, `innerHTML`, or similar sink functions in client-side JavaScript or server-side templating (e.g., PHP). Even when user input flowing into these sinks is not immediately apparent, they can introduce Cross-Site Scripting (XSS) vulnerabilities that an attacker may exploit.**Apply output encoding:** Implement HTML entity encoding on all user-controlled data before rendering it in the browser. This helps neutralize potentially malicious input.**Implement input sanitization:** Ensure that all user-supplied input is properly sanitized before processing or output. Currently, no sanitization mechanisms are in place, which should be addressed as a priority.**Enforce security headers and cookie attributes:****Content Security Policy (CSP):** Define and enforce a strict CSP to limit the execution of unauthorized scripts.**HttpOnly flag:** Set the `HttpOnly` attribute on session cookies to prevent client-side script access.**SameSite attribute:** Configure the `SameSite` cookie attribute to mitigate Cross-Site Request Forgery (CSRF) risks.**Secure flag:** Ensure all cookies are transmitted only over HTTPS by enabling the `Secure` attribute.These measures collectively reduce the impact of XSS and help prevent escalation paths such as CSRF via XSS.Ready Video POC:https://mega.nz/file/PcMiUA5K#L2RlZJa340Q8K42TksxiXMuo_9XsRYPi14-WvBnak2A
CVSS v3.1 score: 9.1