GHSA-v77r-xg3p-75g7 CI4MS: Methods Management Full Account Takeover for All-Roles & Privilege-Escalation via Stored DOM XSS
Summary**Vulnerability: Stored DOM XSS via Methods Management Fields (Global Persistent Payload Execution)**Stored Cross-Site Scripting via Unsanitized Method Creation and Management InputsAutomatic Execution Across All Pages Where Method Is Rendered in NavigationDescriptionThe 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.Affected FunctionalityMethods creation functionalityMethods management and listing functionalityAdministrative navigation renderingPermission-related UI renderingGlobal sidebar / menu renderingStorage and retrieval of method-related dataAffected FieldsThe following fields accept unsanitized input and allow persistent JavaScript injection:Page NameDescriptionControllerMethod NameSeflinkPage OrderSymbol (FontAwesome 5)PermissionsParent PageModuleAttack ScenarioAn attacker creates or edits a method.The attacker injects a malicious XSS payload into any vulnerable field (e.g., Page Name).The application stores the payload without sanitization or encoding.The method is automatically rendered inside the application’s navigation/menu.Every time any user visits any page where the menu is displayed, the malicious JavaScript executes automatically.Because the navigation is globally rendered across backend pages, the XSS triggers on nearly every administrative page visit.ImpactPersistent Stored DOM XSSAutomatic execution across multiple application pagesExecution of arbitrary JavaScript in victims’ browsersPrivilege escalation when viewed by administratorsFull administrator account takeoverFull account takeover across all rolesSession hijackingCSRF token theftComplete compromise of the entire applicationThis vulnerability is highly severe due to:Persistent storageGlobal rendering surfaceAutomatic execution without user interactionHigh likelihood of administrator exposureEndpoints:`/backend/methods/``/backend/methods/create`Steps To Reproduce (POC)Navigate to Methods Management → Create MethodInsert the following payload into Page Name (or any vulnerable field):  
`<img src=x onerror=alert(document.domain)>`Save the methodNavigate to any backend pageObserve the payload executing automatically wherever the malicious method appears in the menuThe XSS triggers across all pages where the navigation is rendered.RemediationNever use `.html()`, `innerHTML`, or equivalent unsafe DOM sinks with untrusted dataImplement strict output encoding (HTML entity encoding) before rendering user inputApply server-side input validation and sanitizationUse contextual escaping depending on rendering context (HTML, attribute, JS, URL)Implement a strong Content Security Policy (CSP)Set cookies with HttpOnly, Secure, and SameSite flagsPerform security review of all navigation rendering logicFailure to properly encode and sanitize user-controlled method fields results in full application compromise through persistent global XSS.Ready Video POC:https://mega.nz/file/CFsiQAJS#cBSF2lCMD7YNZEKYEjw3T8YturY92oBvrdRQ08gmw2A
CVSS v3.1 score: 9.1